My FP2 was one of the unlucky frequently rebooting lot, but after the last update, it became lovely stable. Gosh, that was a relieve!
I don’t know if it is related, but in the last few weeks I noticed that I had to unlock my phone even when I was at home. I had instructed Smart Lock to leave my phone open at home, and from the start it acted likewise. But suddenly it wanted my “signature” every time I had laid it aside for a while.
As keeping it unlocked is related to the position, which is dependant on Google maps, I fiddled with the trusted places, updated my position several times, without success. Also, in Location History I switched FP2 to on, but that did not help either.
But it was the proximity finder… See FP2 proximity sensor not reliably turning off screen during calls - See first Post for Workarounds
Much unexpected, but after I re-calibrating the proximity finder, the problem was gone. 