I did some deep diving but I'm running into walls here with the minidumps. I might have better luck if you provide us crashdumps from crashes caused by
Driver Verifier. Right now though, it seems to me that some variables are getting nulled out, probably because of a memory issue. Run
Memtest86+ for a few hours (at least 7 passes) to ensure that's not the case.
If you can remember any software or driver updates you installed last week that probably will be a good start.