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.