diff --git a/app/src/main/java/com/tomjanson/wifilocationlogger/MainActivity.java b/app/src/main/java/com/tomjanson/wifilocationlogger/MainActivity.java
index 762669e..caa209d 100644
--- a/app/src/main/java/com/tomjanson/wifilocationlogger/MainActivity.java
+++ b/app/src/main/java/com/tomjanson/wifilocationlogger/MainActivity.java
@@ -1,10 +1,15 @@
 package com.tomjanson.wifilocationlogger;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.location.Location;
+import android.media.Ringtone;
+import android.media.RingtoneManager;
+import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.PowerManager;
@@ -263,6 +268,7 @@ void stopLocationUpdates() {
             log.trace("Stopped location updates");
         } else {
             log.warn("Attempted to stop location updates, but not connected");
+            onWarn();
         }
     }
 
@@ -365,6 +371,7 @@ public void onConnected(Bundle connectionHint) {
     @Override
     public void onConnectionFailed(ConnectionResult result) {
         log.warn("GoogleApiClient connection failed: ConnectionResult.getErrorCode() = {}", result.getErrorCode());
+        onWarn();
     }
 
     @Override
@@ -404,4 +411,23 @@ public void removeFocusFromEditText(View view) {
     public void triggerUpload(View view) {
         Uploader.upload(this, "/sdcard/WifiLocationLogger/wifilog.csv");
     }
+
+    private void onWarn() {
+        try {
+            Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
+            Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
+            r.play();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        new AlertDialog.Builder(this)
+            .setTitle(getString(R.string.warning))
+            .setMessage(getString(R.string.warning_msg_logged))
+            .setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                public void onClick(DialogInterface dialog, int which) {
+                }
+            })
+            .setIcon(android.R.drawable.ic_dialog_alert)
+            .show();
+    }
 }
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 9751c55..cfd5113 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -18,4 +18,6 @@
     <string name="upload_failed">Fehler: Upload fehlgeschlagen!</string>
     <string name="upload_file_not_found">Fehler: Logdatei wurde nicht gefunden</string>
     <string name="upload_successful">Upload erfolgreich</string>
+    <string name="warning">Achtung</string>
+    <string name="warning_msg_logged">Ein Ereignis der Kategorie „WARN“ oder höher wurde geloggt. Bitte sende das Debug-Log an den Entwickler. Die App verhält sich wahrscheinlich fehlerhaft.</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2346049..f8db51a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -21,4 +21,6 @@
     <string name="upload_failed">Error: Upload failed!</string>
     <string name="server">Server</string>
     <string name="server_url">Server URL</string>
+    <string name="warning">Warning</string>
+    <string name="warning_msg_logged">An event of category “WARN” or higher was logged. Please send the debug log to the developer. It is likely that the app is misbehaving.</string>
 </resources>