Posted at FP2 Frequent crashes requiring reboot by holding power button >10s yesterday because the topics seem pretty the same:
my FP2 crashed / restarted itself today 5 times (within 3hours range).
Id never happend before and started today just right after I switched the 4G/3G mode to my second SIM Card.
After switching it back to the “old” SIM card it worked fine again.
So in my case its definitely caused by one of my SIM cards and the data transfer with 4G/3G.
Age of SIMs: working one: 1month, non working one: 1 year