I had many many reboots with my original phone, and using GPS was guaranteed to make it reboot multiple times during a journey. In the end I sent it back for a replacement and the new phone arrived earlier this year.
The new phone is much better (only had a single reboot on GPS) but I still get random reboots and screen freezes - 2-3 today. Usually they occur when I’m scrolling through a web page, and the page just becomes unresponsive. Sometimes I can, at that stage, switch off and on (using the power button) and I’m back to a responsive phone, but sometimes the power button does nothing and I know it will reboot itself quite soon.
Hiccup says 64 crashes reported.
I can’t see any link to particular types of activity. My CPU ends in AA.