Lots can cause this sort of issue. I see it a lot dealing with domain environments. I would highly doubt it's bad ssd or hardware related at all.
-pip2kk
I've had the issue quite a few times, and pretty much every single time it was simply a botched install of something, a botched update of something, or something that was required on startup had gone mad....every single time, a reboot was the cure to the problem and it started working just fine.
Backups are a good plan mouser, but, when it comes to the user profile problem...usually a reboot is all it takes - It may well have been something as simple as your PC has decided it would be a fun idea to try load one thing before another thing...when doing so would result in failure.