Continuing the discussion from LoRa APRS Tracker (Part 8):
I had this happen to one of my test units. It was set to sleep on low battery, but just died without a sleep message in the beacon text
I assumed the battery had just died in low temperature. On retrieval to my surprise, when I cycled the power the battery was ok and the igate came back to life.
I now set my igates to reboot every 24 hours and not had any problems over the last few weeks.