I have a very similar issue here and it has just happened now, and several other times in the past : the q10 crashes while running an app ( I was using spotify a few minutes ago ), and I have to turn it off by removing the plug. Then it restarts as if I had just installed the firmware from scratch and all my apps and settings are gone.
It has happend both with Android N firmwares ( now I'm running cfw 2.0.5 ) and with Android 5 firmwares ( 1.0.8 and 1.0.9).
I wonder wether the cause might be the same. In that case I would try buying a new PSU from you.
Thank you
Giacomo