The only time this has ever happened to me, and it happened 6/7 times with both Paradise Life and Lumity Life, was when the charger was jolted or knocked slightly during the night.
This small tap made the HAs wake up and they would either be dead or wailing by the morning.
I simply moved them out of harms way and it never happened again.
There’s a topic on updating the firmware if you are interested:
https://forum.hearingtracker.com/t/phonak-charger-case-go-problems-audeo-life/73554