Zarich,
I may have the same issue. My A7v133 has been stable for a long time since around bios 1004. I have used most bios versions up to the current one. I generally upgrade after there have been no bad reports for a few weeks for a new one.
Recently I have had bluescreens after "heavy" disk work, eg copying files of 100's MB. I think these have been IRQ less than Equal errors. I have also had suspicous USB issues with my USB connected printer only printing a single page then stopping. I had similar problems (USB and large file copies) in the early days of the A7v133, with early bios's.
These problems occurred over the last few weeks whilst using 1008A and perhaps its predecessor. I have dropped back to 1008 Beta 001b and all the problems have vanished.
If your issues sound similar, then yes dropping back a few bios versions may be worth trying.
Regards
BS