Without further information it is difficult to say what exactly is causing this to occur. If we had the stop error message from the blue screen event, that may help. Also, track reboots and your job schedule to see if they coincide in any way. After the next failure, find any warnings or errors in the application event log which occurred shortly prior to the failure.
This could be any numer of things, we will need to gather this information in order to troubleshoot this issue properly.
