My new system has hard locked twice in the past few days, including today, had to shut the system off / on the first time. Both times it has happened while watching a video on YouTube using Brave browser, and with my old system, the Brave browser would at time lock a tab that had Twitch running. So I thought it was something with Brave, but maybe not. When it happened today I waited a bit and it eventually went to the windows blue screen, with an error: DPC_Watchdog. I didn't see the full error code, so I looked up the DPC Watchdog part, found a program that reads the minidump file. Nothing made sense to me, but at the end of the debugging, it showed the cause as likely being an nvidia driver (nlvdmkm or something). The driver for my 5070ti is the most current, and the one which was installed when I got the system. Hasn't locked up while gaming, and I highly doubt any type of overheating. Going to use Chrome for the next few days to see if it happens again.
If anyone has similar issues with their 50-series, let me know.