diff --git a/lib/app/app.cpp b/lib/app/app.cpp
index 6332051..e2a9826 100644
--- a/lib/app/app.cpp
+++ b/lib/app/app.cpp
@@ -14,6 +14,7 @@
 #include "datetime.h"
 #include "faceWeather.h"
 #include "faceCalendar.h"
+#include "faceToday.h"
 #include "download.h"
 
 AsyncWebServer server(80);
@@ -30,7 +31,7 @@ AppConfig appConfig;
 void setupApiDevice();
 void setupApiSettings();
 void setupApiWifi();
-void setupApiUpdate();
+void setupApiCache();
 void setupOTA();
 
 //flag to use from web update to update display
@@ -90,7 +91,7 @@ void setupApp()
 	setupApiDevice();
 	setupApiSettings();
 	setupApiWifi();
-	setupApiUpdate();
+	setupApiCache();
 	setupOTA();
 
 	server.onNotFound([](AsyncWebServerRequest *request) {
@@ -414,11 +415,13 @@ void setupApiWifi()
 }
 
 /**
- * api data endpoint
+ * api cache endpoint
  */
-void setupApiUpdate()
+void setupApiCache()
 {
-	server.on("/api/update", HTTP_GET, [](AsyncWebServerRequest *request) {
+	server.on("/api/cache/clear", HTTP_GET, [](AsyncWebServerRequest *request) {
+		bool warmUp = request->hasParam("warmUp");
+
 		if (request->hasParam("datetime"))
 		{
 			Serial.println("update datetime...");
@@ -428,26 +431,26 @@ void setupApiUpdate()
 
 		if (request->hasParam("weather"))
 		{
-			Serial.println("update weather data...");
+			Serial.println("invalidate weather cache...");
 
-			updateWeatherData();
+			invalidFaceWeatherCache(warmUp);
 		}
 
 		if (request->hasParam("calendar"))
 		{
-			Serial.println("update calendar data...");
+			Serial.println("invalidate calendar cache...");
 
-			updateCalendarData();
+			invalidFaceCalendarCache(warmUp);
 		}
 
-		if (request->getParam("url") && request->hasParam("file"))
+		if (request->hasParam("today"))
 		{
-			Serial.println("file...");
+			Serial.println("invalidate today cache...");
 
-			downloadFile(request->getParam("url")->value().c_str(), request->getParam("file")->value().c_str());
+			invalidFaceTodayCache(warmUp);
 		}
 
-		request->send(200, "application/ld; charset=utf-8", "{}");
+		request->send(200, "application/json; charset=utf-8", "{}");
 	});
 }
 
diff --git a/lib/download/download.cpp b/lib/download/download.cpp
index 4a85fac..a8a366f 100644
--- a/lib/download/download.cpp
+++ b/lib/download/download.cpp
@@ -2,6 +2,7 @@
 #include <SPIFFS.h>
 #include "download.h"
 #include "device.h"
+#include "esp_task_wdt.h"
 
 bool downloadFile(String url, const char *path, const char* CAcert)
 {
@@ -45,6 +46,9 @@ bool downloadFile(String url, const char *path, const char* CAcert)
 	}
 	else
 	{
+		// reset watchdog, is necessary if this method is running on second cpu core
+		esp_task_wdt_reset();
+
 		http.writeToStream(&file);
 
 		if (file)
diff --git a/lib/face/faceCalendar.cpp b/lib/face/faceCalendar.cpp
index 1ad42fe..8175a7a 100644
--- a/lib/face/faceCalendar.cpp
+++ b/lib/face/faceCalendar.cpp
@@ -32,8 +32,7 @@ void loopFaceCalendar()
 	if ((millis() - lastCalendarDataUpdate) >= 600000)
 	{
 		Serial.println(&now, "update calendar data @ %A, %B %d %Y %H:%M:%S");
-		lastCalendarDataUpdate = millis();
-		updateCalendarData();
+		invalidFaceCalendarCache(true);
 	}
 }
 
@@ -50,12 +49,17 @@ void showFaceCalendar()
 	displayFlush();
 }
 
-/**
- * download and update calendar data
- */
-bool updateCalendarData()
+void invalidFaceCalendarCache(bool warmUp)
 {
-	return imageServiceUpdateFile("390x384.jpg", faceCalendarPicture);
+	if (warmUp)
+	{
+		imageServiceUpdateFile("390x384.jpg", faceCalendarPicture);
+		lastCalendarDataUpdate = millis();
+	}
+	else
+	{
+		lastCalendarDataUpdate = 0;
+	}
 }
 
 void display_calender()
diff --git a/lib/face/faceCalendar.h b/lib/face/faceCalendar.h
index 4821d2c..2e46d29 100644
--- a/lib/face/faceCalendar.h
+++ b/lib/face/faceCalendar.h
@@ -5,6 +5,6 @@
 void setupFaceCalendar();
 void loopFaceCalendar();
 void showFaceCalendar();
-bool updateCalendarData();
+void invalidFaceCalendarCache(bool warmUp);
 
 #endif
\ No newline at end of file
diff --git a/lib/face/faceToday.cpp b/lib/face/faceToday.cpp
index a4b8668..90077f7 100644
--- a/lib/face/faceToday.cpp
+++ b/lib/face/faceToday.cpp
@@ -27,8 +27,7 @@ void loopFaceToday()
 	if ((millis() - faceTodayUpdate) >= 600000)
 	{
 		Serial.println(&now, "update today data @ %A, %B %d %Y %H:%M:%S");
-		faceTodayUpdate = millis();
-		imageServiceUpdateFile("640x384.jpg", faceTodayPicture);
+		invalidFaceTodayCache(true);
 	}
 }
 
@@ -49,6 +48,19 @@ void showFaceToday()
 	displayFlush();
 }
 
+void invalidFaceTodayCache(bool warmUp)
+{
+	if (warmUp)
+	{
+		imageServiceUpdateFile("640x384.jpg", faceTodayPicture);
+		faceTodayUpdate = millis();
+	}
+	else
+	{
+		faceTodayUpdate = 0;
+	}
+}
+
 void addTodayDay()
 {
 	// init
@@ -90,7 +102,7 @@ void addTodayWeather()
 	int16_t y = displayGetHeight() - 60;
 
 	// add tile
-	canvas->fillRoundRect(x -1, y -1, 150 + 15, 60 + 15, 15, COLOR_BG); // add border
+	canvas->fillRoundRect(x - 1, y - 1, 150 + 15, 60 + 15, 15, COLOR_BG); // add border
 	canvas->fillRoundRect(x, y, 150 + 15, 60 + 15, 15, COLOR_FG);
 
 	// current weather condition - icon
diff --git a/lib/face/faceToday.h b/lib/face/faceToday.h
index 552e3c2..732ebd0 100644
--- a/lib/face/faceToday.h
+++ b/lib/face/faceToday.h
@@ -4,5 +4,6 @@
 void setupFaceToday();
 void loopFaceToday();
 void showFaceToday();
+void invalidFaceTodayCache(bool warmUp);
 
 #endif
\ No newline at end of file
diff --git a/lib/face/faceWeather.cpp b/lib/face/faceWeather.cpp
index 74cbc55..0bf55f3 100644
--- a/lib/face/faceWeather.cpp
+++ b/lib/face/faceWeather.cpp
@@ -20,10 +20,12 @@ void render_current();
 void render_forecast();
 bool readWeatherData();
 bool isFaceWeatherSetupCompleted();
+bool updateWeatherData();
 
 void setupFaceWeather()
 {
-	if (!isFaceWeatherSetupCompleted()) {
+	if (!isFaceWeatherSetupCompleted())
+	{
 		Serial.println("weather not configured");
 	}
 
@@ -37,7 +39,6 @@ void loopFaceWeather()
 	if ((millis() - lastWeatherDataUpdate) >= 600000)
 	{
 		Serial.println(&now, "update weather data @ %A, %B %d %Y %H:%M:%S");
-		lastWeatherDataUpdate = millis();
 		updateWeatherData();
 	}
 }
@@ -57,6 +58,20 @@ void showFaceWeather()
 	displayFlush();
 }
 
+void invalidFaceWeatherCache(bool warmUp)
+{
+	if (warmUp)
+	{
+		updateWeatherData();
+		lastWeatherDataUpdate = millis();
+	}
+	else
+	{
+
+		lastWeatherDataUpdate = 0;
+	}
+}
+
 bool isFaceWeatherSetupCompleted()
 {
 	return !(NVS.getString("weather.api").isEmpty() || NVS.getString("weather.lang").isEmpty() || NVS.getString("weather.lang").isEmpty());
diff --git a/lib/face/faceWeather.h b/lib/face/faceWeather.h
index dd8e83f..65303ee 100644
--- a/lib/face/faceWeather.h
+++ b/lib/face/faceWeather.h
@@ -38,7 +38,6 @@ extern faceWeatherData weatherData;
 void setupFaceWeather();
 void loopFaceWeather();
 void showFaceWeather();
-
-bool updateWeatherData();
+void invalidFaceWeatherCache(bool warmUp);
 
 #endif
\ No newline at end of file