@seb Everything work fine, after sync again! Thank you very much

@livius Thanks for your help, the gc.collect() has worked and the loop has remained stable for a few hours now.

@RobTuDelft Try closing the socket after each request you make as @this-wiederkehr suggested here. It worked for me.

@wolli01 Hier mein Code import urequests userdata = {"p1": "Wohnzimmer", "p2": "24.12.2018", "p3": "23.97"} url = 'https://Homepage.de/live1.php' res = urequests.post(url, headers={"Content-Type": "application/json", "Accept": "application/json"}, data= str(userdata)) res.close() auf den PHP Server: <?php //Sensor1 $p1 = $_GET["p1"]; $p2 = $_GET["p2"]; $p3 = $_GET["p3"]; $inhalt = array($p1, $p2, $p3); // Speichern der Datei $eintrag = implode(";", $inhalt); file_put_contents("sensor1.txt", $eintrag); ?>