Weird 6900 XT Instability

[TheSLSAMG]

I have a used RX 6900 XT Red Devil that I've owned for almost a year and it has started doing something odd. I can run games for hours on end without any stability issues, it won't even crash running Furmark. However, it will crash while watching videos in a web browser (Firefox, videos/streams from YouTube, Twitter, Twitch, random sports sites, etc.) or while watching people stream on Discord. It's not super consistent, but it will always eventually throw out a driver timeout that breaks graphics acceleration and requires a restart to fix. The issue has moved systems with the card, both test systems are the systems in my signature (my main PC and server.)

Troubleshooting steps tried (in order):

• Repasted the card (had to do that anyways)
• Clean driver uninstall with DDU and reinstall (also got rid of the NVIDIA drivers since I had an NVIDIA card prior to this and didn't realize the drivers were still there)
• Reinstalled Windows on main PC (to rule out Windows issues)
• Swapped from my main PC (sandwich-style Mini-ITX with a riser cable) to my server (no riser cable, direct PCIe connection) to rule out potential PSU (I know LTTLabs didn't review the SP850 well) or riser cable issues

Anyone have any ideas of what else to try? I haven't bothered undervolting/underclocking because if that's the fix, the card is cooked anyways. At this point I'm pretty much ready to go to Micro Center and get an RX 9070 XT.