Henrik,
I have checked the windows event viewer and can see cmd.exe crashing each time the job is running. I am running Windows 2008 SP2 with all updates.
Faulting application cmd.exe, version 6.0.6001.18000, time stamp 0x47918bde, faulting module kernel32.dll, version 6.0.6002.18005, time stamp 0x49e03821, exception code 0xc0000142, fault offset 0x00009eed, process id 0x1bac, application start time 0x01cb458978f13929.