I've spent many hours over a many months on getting the MKR1500 to work reliably with MQTT and thought I finally reached the finish line but today it stopped working. Not connecting to cellular. I tried another MKR1500 and it works. Loaded the serial pass through sketch and there is no response to an AT command. Don't know if this a modem failure or what. Anyway has anyone else experienced the MKR1500 failing in this mode? Does anyone know if there's anyway to 'recover' it? It's not heavy enough for a door stop so don't see any use for it. I was thinking that I could finally go forward with the application but now am thinking that it's just not going to viable for a 24/7/365 application.