So I have the new SD card active and haven’t had any service interruptions in the last 48h. I’m gonna optimistically assume this solved the problem. Thanks again.

I wasn’t aware of a hardware watchdog, thank you very much for that. It’s now turned on and the new SD card has been active since yesterday without hiccups.

Thank you and u/irmadlad for the suggestion. I ordered a new SD card and will just clone the current one. I’ll probably get to it this weekend and let you know if it worked out.