Just happened to me again.
I had the autopi on default power settings, but with no deep sleep for modem. The car was parked. It used up the battery in 16 hours (the battery was at 12.6V at 01:56 on the graph, and at 12.2V at 17:56):
just from waking up on its own every 2.5 hours or whatever the default is. It then went into hibernation. I then went on a drive between 21:00 and 23:00. When i got back home, it turned out it never contacted the cloud again. Moments ago, i went downstairs again, checked if it powers on with the car - it does - whether it has 4G connectivity - it does - and whether i can access the internet through the hotspot - and i can.
But, still nothing from the cloud.
As it went to sleep, i woke it up again, and again, and after 4 attempts - no dice, still no contact from the cloud. This amount of unreliability + the really bad battery life with just the modem running are starting to sour this whole thing for me, only 2 days into my Autopi ownership…