vrtam.sys Causing 0000003b Blue Screens

I have about a dozen Windows 7 SP1 x64 Ent. computers that are regularly getting a 0x0000003b blue screen caused by vrtam.sys.  I had this issue with 11.6.1 and updated these clients to 12.0.1 and the problem persists.

There is nothing in the edpa0.log file and nothing in the Windows Event log.

Any thoughts?