Prior to the start of this rebooting sequence trend I downloaded and installed the stock ROM listed on my signature, hoping that it would alleviate some issues with delay in screen tap response, some occasional heating during gaming along with what I perceived to be a little bit of driver related lag.
I haven't figured out when, why, or how it decides to reboot. But as far as I can tell it seems to be related to [behind the scenes machinery of] Google Play (GP). I suspect this because it has happened when I've launched GP or GP tried to do some updates or software installation.
Incidentally, though possibly unrelated, when I try to add an account via settings, at the sign in page, the device returns unable to sign-in message citing connectivity issues. I am in China, so I suspect this could all be related. To get around this issue, I log into a VPN service. This allows me to sign in and add the account to the device. However, in order to play any games, I must log off the VPN. But once the account has been added to the device, it more-or-less is able to access some of the Google services (at least the ones not outright blocked -such as drive and YouTube).
In my troubleshooting attempts, I have thus far done a cache wipe and factory reset from the boot menu. All to no avail.
At this point I need to live in constant fear of a sudden reboot, for I know not when it will strike next.
I would appreciate some suggestions on either what the issue might be, how to determine the cause, or how to solve it.