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My Pixel phone reboots randomly on its own
(sh.itjust.works)
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A faulty power button can 100% cause what you're describing. It's mandatory for the power button to reset the phone if pressed for some time, and you say that some times when you try to lock it it shows the power menu which indicates that the button is closing the circuit on its own. So if it does that for about 20 seconds it can just reboot the phone.
Thanks! I think I'll get that checked soon. Shame that I press it often for the camera shortcut. Maybe that's the reason why it broke.