I didn’t bother to check this, but it’s a great suggestion to do so. I didn’t have Fedora/Ubuntu ready to go and I wasn’t sure if I’d receive any support if I was trying to troubleshoot with a non-supported OS so I didn’t even think to check dmesg logs. That being said, I did monitor it in Device Manager in W11 and see the continual disconnects/reconnects as it was happening.
Upon checking dmesg on my NixOS drive, yes, I see the continual disconnect/reconnects in the dmesg logs as well. Seems like it’s detecting it as a new device continually
Yeah, the whole deck dies altogether, fingerprint reader included. I actually had to disable the fingerprint reader specifically in the BIOS because it was causing the system not to be able to reboot while it was re-initializing when I would attempt to restart the machine. Keyboard/numpad/trackpad don’t seem to cause the system to hang when rebooting for whatever reason.
Seems sort of random within that 0-30 second window after the issue starts. I have noticed that if the machine has been off for any length of time, it’ll take a while (5-10 minutes or so) for this error to crop up. Thinking about it now, could potentially be more mainboard related if it’s somehow related to once the machine reaches a certain thermal threshold. That being said, the fans appear to be working and I’ve not seen the machine reach anything outside of spec temps so I didn’t think about thermals much more beyond that.
I just tried this and it’s been about 30 minutes since the last disconnection. I haven’t used the machine all day due to work needing to get done, so we’ll see how real this is as a solution. But that would point pretty firmly at the chip you mentioned malfunctioning
Thank you for all of your help by the way. Very much appreciate the willingness to provide some suggestions 
EDIT:
After further troubleshooting, I can confirm it’s definitely something to do either with the midplate entirely or the module presence detection chip. Switching the BIOS option to “Force On” for this, fixes things. Switching it to “Require Modules” and the lightshow (due to backlights of the modules) begins again.
Here’s hoping support sees this exhaustive troubleshooting and sends me a new midplate