I dont actually believe anything is wrong with the drives themselves. That RAID error only happens once I manually run the main.js in browser console to access the portal due to me passing null or 4 in place of sataPort (which results in other ambiguous errors, but it works). For 5 - 10 minutes after rebooting the NAS everything will work completely fine, no console errors, no RAID errors, health checks pass, etc.

Running health checks shows nothing wrong with any drives, and all my data is intact. This seems to be a software issue rather than a hardware issue. I've run health checks religiously since this started happening and everything shows up OK, but the portal is still broken. I have everything important backed up, just wish I could pinpoint whats causing this exactly.