diff --git a/README.md b/README.md
index 3a1fdf4..a3fc5f9 100644
--- a/README.md
+++ b/README.md
@@ -234,6 +234,14 @@ Work is in progress...
 
 ---
 ## Version history
+### 0.9.561
+**!!! a [full update](#update-over-web-interface) with Sketch data upload is required !!!**\
+  or-> just upload `yoRadio/data/www/script.js.gz` to Webboard Uploader http://radioipaddr/webboard\
+  After updating please clear browser cache.
+- fixed error when switching to SD Card mode
+- fixed issue causing random reboots
+- fixed preview playback bug in Playlist Editor
+
 ### 0.9.555
 - fixed error "assert failed: udp_new_ip_type /IDF/components/lwip/lwip/src/core/udp.c:1278 (Required to lock TCPIP core functionality!)"\
   part #2
diff --git a/yoRadio/data/www/script.js.gz b/yoRadio/data/www/script.js.gz
index 4787539..10fdd22 100644
Binary files a/yoRadio/data/www/script.js.gz and b/yoRadio/data/www/script.js.gz differ
diff --git a/yoRadio/src/AsyncWebServer/AsyncWebSocket.cpp b/yoRadio/src/AsyncWebServer/AsyncWebSocket.cpp
index 1fe20ae..c6451e5 100644
--- a/yoRadio/src/AsyncWebServer/AsyncWebSocket.cpp
+++ b/yoRadio/src/AsyncWebServer/AsyncWebSocket.cpp
@@ -1225,12 +1225,14 @@ AsyncWebSocketMessageBuffer * AsyncWebSocket::makeBuffer(uint8_t * data, size_t
 void AsyncWebSocket::_cleanBuffers()
 {
   AsyncWebLockGuard l(_lock);
-
-  for(AsyncWebSocketMessageBuffer * c: _buffers){
+  while (_buffers.remove_first([](AsyncWebSocketMessageBuffer* b) {
+    return b && b->canDelete();
+  }));
+  /*for(AsyncWebSocketMessageBuffer * c: _buffers){
     if(c && c->canDelete()){
         _buffers.remove(c);
     }
-  }
+  }*/
 }
 
 AsyncWebSocket::AsyncWebSocketClientLinkedList AsyncWebSocket::getClients() const {
diff --git a/yoRadio/src/AsyncWebServer/AsyncWebSocket.h b/yoRadio/src/AsyncWebServer/AsyncWebSocket.h
index 05dc53f..0578277 100644
--- a/yoRadio/src/AsyncWebServer/AsyncWebSocket.h
+++ b/yoRadio/src/AsyncWebServer/AsyncWebSocket.h
@@ -86,9 +86,8 @@ class AsyncWebSocketMessageBuffer {
   private:
     uint8_t * _data;
     size_t _len;
-    bool _lock; 
+    volatile bool _lock;
     uint32_t _count;  
-
   public:
     AsyncWebSocketMessageBuffer();
     AsyncWebSocketMessageBuffer(size_t size);
diff --git a/yoRadio/src/audioVS1053/audioVS1053Ex.cpp b/yoRadio/src/audioVS1053/audioVS1053Ex.cpp
index e6dea96..00f6e3a 100644
--- a/yoRadio/src/audioVS1053/audioVS1053Ex.cpp
+++ b/yoRadio/src/audioVS1053/audioVS1053Ex.cpp
@@ -1717,7 +1717,6 @@ void Audio::setConnectionTimeout(uint16_t timeout_ms, uint16_t timeout_ms_ssl){
 void Audio::connectTask(void* pvParams) {
   ConnectParams* params = static_cast<ConnectParams*>(pvParams);
   Audio* self = params->instance;
-  bool res = true;
   if(self->_client){
     self->_connectionResult = self->_client->connect(params->hostwoext, params->port/*, self->m_f_ssl ? self->m_timeout_ms_ssl : self->m_timeout_ms*/);
   }else{
diff --git a/yoRadio/src/core/config.cpp b/yoRadio/src/core/config.cpp
index 21bba5f..039c0cc 100644
--- a/yoRadio/src/core/config.cpp
+++ b/yoRadio/src/core/config.cpp
@@ -175,8 +175,10 @@ void Config::changeMode(int newmode){
   if(getMode()==PM_SDCARD){
     if(pir) player.sendCommand({PR_STOP, 0});
     display.putRequest(NEWMODE, SDCHANGE);
+    #ifdef NETSERVER_LOOP1
     while(display.mode()!=SDCHANGE)
       delay(10);
+    #endif
     delay(50);
   }
   if(getMode()==PM_WEB) {
@@ -222,6 +224,11 @@ bool Config::spiffsCleanup(){
   return ret;
 }
 
+void Config::waitConnection(){
+  while(!player.connproc) vTaskDelay(50);
+  vTaskDelay(500);
+}
+
 char * Config::ipToStr(IPAddress ip){
   snprintf(ipBuf, 16, "%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
   return ipBuf;
diff --git a/yoRadio/src/core/config.h b/yoRadio/src/core/config.h
index bbd577c..feeb4d0 100644
--- a/yoRadio/src/core/config.h
+++ b/yoRadio/src/core/config.h
@@ -280,6 +280,7 @@ class Config {
 #endif
     void resetSystem(const char *val, uint8_t clientId);
     bool spiffsCleanup();
+    void waitConnection();
     char * ipToStr(IPAddress ip);
     bool prepareForPlaying(uint16_t stationId);
     void configPostPlaying(uint16_t stationId);
diff --git a/yoRadio/src/core/display.cpp b/yoRadio/src/core/display.cpp
index 170f77e..f8ee071 100644
--- a/yoRadio/src/core/display.cpp
+++ b/yoRadio/src/core/display.cpp
@@ -22,6 +22,16 @@ Nextion nextion;
 #ifndef DSP_TASK_CORE_ID
   #define DSP_TASK_CORE_ID  0
 #endif
+#ifndef DSP_TASK_DELAY
+  #define DSP_TASK_DELAY pdMS_TO_TICKS(10) // cap for 50 fps
+#endif
+
+#define DSP_QUEUE_TICKS 0
+
+#ifndef DSQ_SEND_DELAY
+  //#define DSQ_SEND_DELAY portMAX_DELAY
+  #define DSQ_SEND_DELAY  pdMS_TO_TICKS(200)
+#endif
 
 QueueHandle_t displayQueue;
 
@@ -29,16 +39,19 @@ static void loopDspTask(void * pvParameters){
   while(true){
   #ifndef DUMMYDISPLAY
     if(displayQueue==NULL) break;
-    netserver.loop();
-    if(timekeeper.loop0())
+    if(timekeeper.loop0()){
       display.loop();
-    // will NOT delay here, would use message dequeue timeout instead
-    //vTaskDelay(DSP_TASK_DELAY);
+    #ifndef NETSERVER_LOOP1
+      netserver.loop();
+    #endif
+    }
   #else
-    netserver.loop();
     timekeeper.loop0();
-    vTaskDelay(10);
+    #ifndef NETSERVER_LOOP1
+      netserver.loop();
+    #endif
   #endif
+    vTaskDelay(DSP_TASK_DELAY);
   }
   vTaskDelete( NULL );
 }
@@ -53,18 +66,6 @@ DspCore dsp;
 
 Page *pages[] = { new Page(), new Page(), new Page(), new Page() };
 
-#ifndef DSQ_SEND_DELAY
-  //#define DSQ_SEND_DELAY portMAX_DELAY
-  #define DSQ_SEND_DELAY  pdMS_TO_TICKS(200)
-#endif
-
-#ifndef DSP_TASK_DELAY
-  #define DSP_TASK_DELAY pdMS_TO_TICKS(20) // cap for 50 fps
-#endif
-
-// will use DSP_QUEUE_TICKS as delay interval for display task runner when there are no msgs in a queue to process
-#define DSP_QUEUE_TICKS DSP_TASK_DELAY
-
 #if !((DSP_MODEL==DSP_ST7735 && DTYPE==INITR_BLACKTAB) || DSP_MODEL==DSP_ST7789 || DSP_MODEL==DSP_ST7796 || DSP_MODEL==DSP_ILI9488 || DSP_MODEL==DSP_ILI9486 || DSP_MODEL==DSP_ILI9341 || DSP_MODEL==DSP_ILI9225)
   #undef  BITRATE_FULL
   #define BITRATE_FULL     false
@@ -397,7 +398,7 @@ void Display::loop() {
     _bootScreen();
     return;
   }
-  if(displayQueue==NULL) return;
+  if(displayQueue==NULL || _locked) return;
   _pager.loop();
 #ifdef USE_NEXTION
   nextion.loop();
diff --git a/yoRadio/src/core/display.h b/yoRadio/src/core/display.h
index cb3b14c..4df0bf8 100644
--- a/yoRadio/src/core/display.h
+++ b/yoRadio/src/core/display.h
@@ -37,6 +37,8 @@ class Display {
     void wakeup();
     void setContrast();
     void printPLitem(uint8_t pos, const char* item);
+    void lock()   { _locked=true; }
+    void unlock() { _locked=false; }
   private:
     ScrollWidget _meta, _title1, _plcurrent;
     ScrollWidget *_weather;
@@ -52,6 +54,7 @@ class Display {
     ClockWidget _clock;
     Page *_boot;
     TextWidget *_bootstring, *_volip, *_voltxt, *_rssi, *_bitrate;
+    bool _locked = false;
     uint8_t _bootStep;
     void _time(bool redraw = false);
     void _apScreen();
diff --git a/yoRadio/src/core/mqtt.cpp b/yoRadio/src/core/mqtt.cpp
index 7e26585..c818bed 100644
--- a/yoRadio/src/core/mqtt.cpp
+++ b/yoRadio/src/core/mqtt.cpp
@@ -12,7 +12,7 @@ TimerHandle_t mqttReconnectTimer;
 char topic[100], status[BUFLEN+50];
 
 void connectToMqtt() {
-  while(!player.connproc) vTaskDelay(50);
+  //config.waitConnection();
   mqttClient.connect();
 }
 
diff --git a/yoRadio/src/core/netserver.cpp b/yoRadio/src/core/netserver.cpp
index 048d503..c83d7c8 100644
--- a/yoRadio/src/core/netserver.cpp
+++ b/yoRadio/src/core/netserver.cpp
@@ -11,7 +11,7 @@
 #include "commandhandler.h"
 #include "timekeeper.h"
 #include <Update.h>
-#include <ESPmDNS.h>
+
 //#include <Ticker.h>
 
 #ifdef USE_SD
@@ -21,7 +21,12 @@
 #define MIN_MALLOC 24112
 #endif
 #ifndef NSQ_SEND_DELAY
-  #define NSQ_SEND_DELAY       pdMS_TO_TICKS(100)  //portMAX_DELAY?
+  //#define NSQ_SEND_DELAY       portMAX_DELAY
+  #define NSQ_SEND_DELAY       pdMS_TO_TICKS(300)
+#endif
+#ifndef NS_QUEUE_TICKS
+  //#define NS_QUEUE_TICKS pdMS_TO_TICKS(2)
+  #define NS_QUEUE_TICKS 0
 #endif
 
 //#define CORS_DEBUG //Enable CORS policy: 'Access-Control-Allow-Origin' (for testing)
@@ -72,8 +77,8 @@ bool NetServer::begin(bool quiet) {
   DefaultHeaders::Instance().addHeader(F("Access-Control-Allow-Headers"), F("content-type"));
 #endif
   webserver.begin();
-  if(strlen(config.store.mdnsname)>0)
-    MDNS.begin(config.store.mdnsname);
+  //if(strlen(config.store.mdnsname)>0)
+  //  MDNS.begin(config.store.mdnsname);
   websocket.onEvent(onWsEvent);
   webserver.addHandler(&websocket);
   if(!quiet) Serial.println("done");
@@ -93,10 +98,12 @@ size_t NetServer::chunkedHtmlPageCallback(uint8_t* buffer, size_t maxLen, size_t
   size_t needread = filesize - index;
   if (!needread) {
     requiredfile.close();
+    display.unlock();
     return 0;
   }
   size_t canread = (needread > maxLen) ? maxLen : needread;
   DBGVB("[%s] seek to %d in %s and read %d bytes with maxLen=%d", __func__, index, netserver.chunkedPathBuffer, canread, maxLen);
+  //netserver.loop();
   requiredfile.seek(index, SeekSet);
   requiredfile.read(buffer, canread);
   index += canread;
@@ -108,6 +115,9 @@ void NetServer::chunkedHtmlPage(const String& contentType, AsyncWebServerRequest
   memset(chunkedPathBuffer, 0, sizeof(chunkedPathBuffer));
   strlcpy(chunkedPathBuffer, path, sizeof(chunkedPathBuffer)-1);
   AsyncWebServerResponse *response;
+  #ifndef NETSERVER_LOOP1
+  display.lock();
+  #endif
   response = request->beginChunkedResponse(contentType, chunkedHtmlPageCallback);
   response->addHeader("Cache-Control","max-age=31536000");
   request->send(response);
@@ -124,10 +134,6 @@ void NetServer::chunkedHtmlPage(const String& contentType, AsyncWebServerRequest
   #define SHOW_WEATHER  false
 #endif
 
-#ifndef NS_QUEUE_TICKS
-  #define NS_QUEUE_TICKS 2
-#endif
-
 const char *getFormat(BitrateFormat _format) {
   switch (_format) {
     case BF_MP3:  return "MP3";
@@ -308,13 +314,14 @@ void NetServer::loop() {
     delay(100);
     ESP.restart();
   }
+  processQueue();
   websocket.cleanupClients();
   switch (importRequest) {
     case IMPL:    importPlaylist();  importRequest = IMDONE; break;
     case IMWIFI:  config.saveWifi(); importRequest = IMDONE; break;
     default:      break;
   }
-  processQueue();
+  //processQueue();
 }
 
 #if IR_PIN!=255
diff --git a/yoRadio/src/core/network.cpp b/yoRadio/src/core/network.cpp
index d16d4b2..5eac81e 100644
--- a/yoRadio/src/core/network.cpp
+++ b/yoRadio/src/core/network.cpp
@@ -7,6 +7,7 @@
 #include "player.h"
 #include "mqtt.h"
 #include "timekeeper.h"
+#include <ESPmDNS.h>
 
 #ifndef WIFI_ATTEMPTS
   #define WIFI_ATTEMPTS  16
@@ -154,6 +155,8 @@ void MyNetwork::setWifiParams(){
   WiFi.onEvent(WiFiReconnected, WiFiEvent_t::ARDUINO_EVENT_WIFI_STA_GOT_IP);
   WiFi.onEvent(WiFiLostConnection, WiFiEvent_t::ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
   //config.setTimeConf(); //??
+  if(strlen(config.store.mdnsname)>0)
+    MDNS.begin(config.store.mdnsname);
 }
 
 void MyNetwork::requestTimeSync(bool withTelnetOutput, uint8_t clientId) {
diff --git a/yoRadio/src/core/options.h b/yoRadio/src/core/options.h
index ed51ff4..e86b507 100644
--- a/yoRadio/src/core/options.h
+++ b/yoRadio/src/core/options.h
@@ -1,7 +1,7 @@
 #ifndef options_h
 #define options_h
 
-#define YOVERSION "0.9.555"
+#define YOVERSION "0.9.561"
 
 /*******************************************************
 DO NOT EDIT THIS FILE. 
diff --git a/yoRadio/src/core/timekeeper.cpp b/yoRadio/src/core/timekeeper.cpp
index 94db7a3..8abdb76 100644
--- a/yoRadio/src/core/timekeeper.cpp
+++ b/yoRadio/src/core/timekeeper.cpp
@@ -206,6 +206,7 @@ void TimeKeeper::_upSDPos(){
 
 void TimeKeeper::timeTask(){
   static uint8_t tsFailCnt = 0;
+  config.waitConnection();
   if(getLocalTime(&network.timeinfo)){
     tsFailCnt = 0;
     forceTimeSync = false;
@@ -226,8 +227,8 @@ void TimeKeeper::timeTask(){
   }
 }
 void TimeKeeper::weatherTask(){
-  if(!weatherBuf || strlen(config.store.weatherkey)==0 || !config.store.showweather) return;
   forceWeather = false;
+  if(!weatherBuf || strlen(config.store.weatherkey)==0 || !config.store.showweather) return;
   _getWeather();
 }
 
@@ -328,7 +329,7 @@ bool _getWeather() {
       }
     }, NULL); // <-- client->onData
   }, NULL); // <-- weatherClient->onConnect
-  while(!player.connproc) vTaskDelay(50);
+  config.waitConnection();
   if(!weatherClient->connect(host, 80)){
     Serial.println("##WEATHER###: connection failed");
     AsyncClient * client = weatherClient;
diff --git a/yoRadio/src/main.cpp b/yoRadio/src/main.cpp
index 6a39482..2000e30 100644
--- a/yoRadio/src/main.cpp
+++ b/yoRadio/src/main.cpp
@@ -99,7 +99,6 @@ void setup() {
   if (config.getMode()==PM_SDCARD) player.initHeaders(config.station.url);
   player.lockOutput=false;
   if (config.store.smartstart == 1) {
-    delay(250);
     player.sendCommand({PR_PLAY, config.lastStation()});
   }
   pm.on_end_setup();
@@ -115,7 +114,9 @@ void loop() {
 #endif
   }
   loopControls();
-  //netserver.loop();
+  #ifdef NETSERVER_LOOP1
+  netserver.loop();
+  #endif
 }
 
 #include "core/audiohandlers.h"