Help with Pixel 8 randomly restarting and accessing Google Gemini shortcut?

Hi all, I'm new to this sub and coming to ask for some help. My Pixel 8 has been randomly restarting itself for the last 3 days or so. It doesn't seem to be caught in a reboot loop that I've seen other common reports about, as it will fully restart and then I will be able to use it for a period of time until it does the same thing again. It seems like it might have to do with the power button on the right side, as a few times before powering down the phone will try starting Google Gemini via some button shortcut, or will try to quickly open the camera based on some shortcut.

Also worth mentioning that I don't own a case. I have dropped the phone a good amount of time, but no visible cracks or damage near the power button that I can immediately see. Does anyone know if there's a specific fix here or is this a sign of considering to buy a new phone and case?