i would probably point the finger of blame at DFX - i know people were getting random crashes / lockups when using it with DFX 9, so it could be something similar with DFX 10.
so really you're going to need to disable DFX and see if the issue still happens and if it does then see if they have an update or report the issue to them to see if they can do anything to fix it.
-daz
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