diff --git a/.gitignore b/.gitignore
index 89cc49c..b18cbdd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,6 @@
 .vscode/c_cpp_properties.json
 .vscode/launch.json
 .vscode/ipch
+.vscode/extensions.json
+.vscode/settings.json
+data
diff --git a/platformio.ini b/platformio.ini
index dc7cd21..c1ba693 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -52,6 +52,7 @@ build_flags =
     -mtext-section-literals
     -DVERSION=\"${common.version}\"
     -DTOOLDVERSION=\"${common.to_old_version}\"
+    #-DENABLE_HEAP_DEBUGGING
     -DASYNCWEBSERVER_REGEX
     #-DCORE_DEBUG_LEVEL=3
     -DCONFIG_ARDUHAL_LOG_COLORS=1
diff --git a/src/api.cpp b/src/api.cpp
index 12a96d8..cb42bdc 100644
--- a/src/api.cpp
+++ b/src/api.cpp
@@ -3,6 +3,7 @@
 #include <ArduinoJson.h>
 #include "commonFS.h"
 #include <Preferences.h>
+#include "debug.h"
 
 volatile spoolmanApiStateType spoolmanApiState = API_INIT;
 //bool spoolman_connected = false;
@@ -88,6 +89,8 @@ JsonDocument fetchSingleSpoolInfo(int spoolId) {
 }
 
 void sendToApi(void *parameter) {
+    HEAP_DEBUG_MESSAGE("sendToApi begin");
+
     spoolmanApiState = API_TRANSMITTING;
     SendToApiParams* params = (SendToApiParams*)parameter;
 
@@ -132,8 +135,8 @@ void sendToApi(void *parameter) {
             }
             
             vTaskDelay(3000 / portTICK_PERIOD_MS);
-            doc.clear();
         }
+        doc.clear();
 
     } else {
         Serial.println("Fehler beim Senden an Spoolman! HTTP Code: " + String(httpCode));
@@ -146,8 +149,9 @@ void sendToApi(void *parameter) {
 
     // Speicher freigeben
     delete params;
-    vTaskDelete(NULL);
+    HEAP_DEBUG_MESSAGE("sendToApi end");
     spoolmanApiState = API_IDLE;
+    vTaskDelete(NULL);
 }
 
 bool updateSpoolTagId(String uidString, const char* payload) {
@@ -170,6 +174,8 @@ bool updateSpoolTagId(String uidString, const char* payload) {
     Serial.print("Update Spule mit URL: ");
     Serial.println(spoolsUrl);
     
+    doc.clear();
+
     // Update Payload erstellen
     JsonDocument updateDoc;
     updateDoc["extra"]["nfc_id"] = "\""+uidString+"\"";
@@ -208,6 +214,7 @@ bool updateSpoolTagId(String uidString, const char* payload) {
 }
 
 uint8_t updateSpoolWeight(String spoolId, uint16_t weight) {
+    HEAP_DEBUG_MESSAGE("updateSpoolWeight begin");
     String spoolsUrl = spoolmanUrl + apiUrl + "/spool/" + spoolId + "/measure";
     Serial.print("Update Spule mit URL: ");
     Serial.println(spoolsUrl);
@@ -242,11 +249,14 @@ uint8_t updateSpoolWeight(String spoolId, uint16_t weight) {
     );
 
     updateDoc.clear();
+    HEAP_DEBUG_MESSAGE("updateSpoolWeight end");
 
     return 1;
 }
 
 uint8_t updateSpoolLocation(String spoolId, String location){
+    HEAP_DEBUG_MESSAGE("updateSpoolLocation begin");
+
     String spoolsUrl = spoolmanUrl + apiUrl + "/spool/" + spoolId;
     Serial.print("Update Spule mit URL: ");
     Serial.println(spoolsUrl);
@@ -282,6 +292,7 @@ uint8_t updateSpoolLocation(String spoolId, String location){
 
     updateDoc.clear();
 
+    HEAP_DEBUG_MESSAGE("updateSpoolLocation end");
     return 1;
 }
 
@@ -346,6 +357,10 @@ bool updateSpoolBambuData(String payload) {
 
     String updatePayload;
     serializeJson(updateDoc, updatePayload);
+
+    doc.clear();
+    updateDoc.clear();
+
     Serial.print("Update Payload: ");
     Serial.println(updatePayload);
 
@@ -512,6 +527,7 @@ bool checkSpoolmanExtraFields() {
                     vTaskDelay(100 / portTICK_PERIOD_MS);
                 }
             }
+            doc.clear();
         }
     }
     
@@ -558,6 +574,8 @@ bool checkSpoolmanInstance(const String& url) {
                 oledShowTopRow();
                 return strcmp(status, "healthy") == 0;
             }
+
+            doc.clear();
         }
     } else {
         Serial.println("Error contacting spoolman instance! HTTP Code: " + String(httpCode));
@@ -581,6 +599,8 @@ bool saveSpoolmanUrl(const String& url, bool octoOn, const String& octo_url, con
     octoUrl = octo_url;
     octoToken = octoTk;
 
+    doc.clear();
+
     return true;
 }
 
diff --git a/src/debug.h b/src/debug.h
new file mode 100644
index 0000000..8cc1efc
--- /dev/null
+++ b/src/debug.h
@@ -0,0 +1,12 @@
+#include <Arduino.h>
+
+
+#ifdef ENABLE_HEAP_DEBUGGING
+    #define HEAP_DEBUG_MESSAGE(location) printHeapDebugData(location);
+#else
+    #define HEAP_DEBUG_MESSAGE(location) 
+#endif
+
+inline void printHeapDebugData(String location){
+    Serial.println("Heap: " + String(ESP.getMinFreeHeap()/1024) + "\t" + String(ESP.getFreeHeap()/1024) + "\t" + String(ESP.getMaxAllocHeap()/1024) + "\t" + location);
+}
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 76de6f4..96fa2f0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -212,14 +212,14 @@ void loop() {
   lastWeight = weight;
 
   // Wenn ein Tag mit SM id erkannte wurde und der Waage Counter anspricht an SM Senden
-  if (spoolId != "" && weigthCouterToApi > 3 && weightSend == 0 && nfcReaderState == NFC_READ_SUCCESS) {
+  if (activeSpoolId != "" && weigthCouterToApi > 3 && weightSend == 0 && nfcReaderState == NFC_READ_SUCCESS) {
     oledShowIcon("loading");
-    if (updateSpoolWeight(spoolId, weight)) 
+    if (updateSpoolWeight(activeSpoolId, weight)) 
     {
       oledShowIcon("success");
       vTaskDelay(2000 / portTICK_PERIOD_MS);
       weightSend = 1;
-      autoSetToBambuSpoolId = spoolId.toInt();
+      autoSetToBambuSpoolId = activeSpoolId.toInt();
 
       if (octoEnabled) 
       {
diff --git a/src/nfc.cpp b/src/nfc.cpp
index 83bfe7c..e7aec4b 100644
--- a/src/nfc.cpp
+++ b/src/nfc.cpp
@@ -15,7 +15,8 @@ Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
 TaskHandle_t RfidReaderTask;
 
 JsonDocument rfidData;
-String spoolId = "";
+String activeSpoolId = "";
+String lastSpoolId = "";
 String nfcJsonData = "";
 volatile bool pauseBambuMqttTask = false;
 
@@ -65,6 +66,8 @@ void payloadToJson(uint8_t *data) {
         Serial.print("deserializeJson() failed: ");
         Serial.println(error.f_str());
       }
+
+      doc.clear();
     } else {
         Serial.println("Kein gültiger JSON-Inhalt gefunden oder fehlerhafte Formatierung.");
         //writeJsonToTag("{\"version\":\"1.0\",\"protocol\":\"NFC\",\"color_hex\":\"#FFFFFF\",\"type\":\"Example\",\"min_temp\":10,\"max_temp\":30,\"brand\":\"BrandName\"}");
@@ -219,17 +222,18 @@ bool decodeNdefAndReturnJson(const byte* encodedMessage) {
     // Sende die aktualisierten AMS-Daten an alle WebSocket-Clients
     Serial.println("JSON-Dokument erfolgreich verarbeitet");
     Serial.println(doc.as<String>());
-    if (doc.containsKey("sm_id") && doc["sm_id"] != "") 
+    if (doc["sm_id"].is<String>() && doc["sm_id"] != "") 
     {
       Serial.println("SPOOL-ID gefunden: " + doc["sm_id"].as<String>());
-      spoolId = doc["sm_id"].as<String>();
+      activeSpoolId = doc["sm_id"].as<String>();
+      lastSpoolId = activeSpoolId;
     }
-    else if(doc.containsKey("location") && doc["location"] != "")
+    else if(doc["location"].is<String>() && doc["location"] != "")
     {
       Serial.println("Location Tag found!");
       String location = doc["location"].as<String>();
-      if(spoolId != ""){
-        updateSpoolLocation(spoolId, location);
+      if(lastSpoolId != ""){
+        updateSpoolLocation(lastSpoolId, location);
       }
       else
       {
@@ -241,12 +245,14 @@ bool decodeNdefAndReturnJson(const byte* encodedMessage) {
     else 
     {
       Serial.println("Keine SPOOL-ID gefunden.");
-      spoolId = "";
+      activeSpoolId = "";
       oledShowMessage("Unknown Spool");
       vTaskDelay(2000 / portTICK_PERIOD_MS);
     }
   }
 
+  doc.clear();
+
   return true;
 }
 
@@ -447,6 +453,7 @@ void scanRfidTask(void * parameter) {
         nfcReaderState = NFC_IDLE;
         //uidString = "";
         nfcJsonData = "";
+        activeSpoolId = "";
         Serial.println("Tag entfernt");
         if (!bambuCredentials.autosend_enable) oledShowWeight(weight);
       }
diff --git a/src/nfc.h b/src/nfc.h
index 0d964f2..8f8cf5a 100644
--- a/src/nfc.h
+++ b/src/nfc.h
@@ -19,7 +19,8 @@ void startWriteJsonToTag(const char* payload);
 
 extern TaskHandle_t RfidReaderTask;
 extern String nfcJsonData;
-extern String spoolId;
+extern String activeSpoolId;
+extern String lastSpoolId;
 extern volatile nfcReaderStateType nfcReaderState;
 extern volatile bool pauseBambuMqttTask;
 
diff --git a/src/website.cpp b/src/website.cpp
index d554235..f87dba2 100644
--- a/src/website.cpp
+++ b/src/website.cpp
@@ -11,6 +11,8 @@
 #include "display.h"
 #include "ota.h"
 #include "config.h"
+#include "debug.h"
+
 
 #ifndef VERSION
   #define VERSION "1.1.0"
@@ -27,6 +29,7 @@ nfcReaderStateType lastnfcReaderState = NFC_IDLE;
 
 
 void onWsEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventType type, void *arg, uint8_t *data, size_t len) {
+    HEAP_DEBUG_MESSAGE("onWsEvent begin");
     if (type == WS_EVT_CONNECT) {
         Serial.println("Neuer Client verbunden!");
         // Sende die AMS-Daten an den neuen Client
@@ -34,6 +37,10 @@ void onWsEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventTyp
         sendNfcData(client);
         foundNfcTag(client, 0);
         sendWriteResult(client, 3);
+
+        // Clean up dead connections
+        (*server).cleanupClients();
+        Serial.println("Currently connected number of clients: " + String((*server).getClients().size()));
     } else if (type == WS_EVT_DISCONNECT) {
         Serial.println("Client getrennt.");
     } else if (type == WS_EVT_ERROR) {
@@ -114,7 +121,9 @@ void onWsEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventTyp
         else {
             Serial.println("Unbekannter WebSocket-Typ: " + doc["type"].as<String>());
         }
+        doc.clear();
     }
+    HEAP_DEBUG_MESSAGE("onWsEvent end");
 }
 
 // Funktion zum Laden und Ersetzen des Headers in einer HTML-Datei
@@ -264,6 +273,8 @@ void setupWebserver(AsyncWebServer &server) {
         html.replace("{{autoSendToBambu}}", bambuCredentials.autosend_enable ? "checked" : "");
         html.replace("{{autoSendTime}}", (bambuCredentials.autosend_time != 0) ? String(bambuCredentials.autosend_time) : String(BAMBU_DEFAULT_AUTOSEND_TIME));
 
+        doc.clear();
+
         request->send(200, "text/html", html);
     });