Nearly 4 months ago I posted about my Pixel 8a rebooting shortly after I booted the phone in the morning. It starts-up OK and runs fine for "about" a minute, then it locks-up and reboots. It only does this once per day. I've simply catered for the issue as part of my morning routine, as in, I'll boot the phone and put it down, then go make breakfast, and by the time I'm done the phone has performed its reboot.
I've not caught it rebooting itself after I've done a reboot for a system update.
I get no notifications of any problems after the reboot.