Problems after defrag

I defragged the drive I use for recording, I run Nuendo off of a separate drive. Since the defrag it’s been hanging and then bailing, the debug message says it’s closing using an unusual method. Whatever occurs sometimes prevents the windows from shutting down and I have to reset.

Any ideas or experiences that might help out there?

I updated the software and the MR drivers and I think the problem has gone away. Sadly I upgraded PowerCore as well and now I’ve a problem with my VST plugins but that’s a subject for TCElectronic