No patches yet for DP 8
You can get the session report to see what was the time of failure, and check that against the debug.log file, that may give you some very rudimentary information. I would check the Cell Server, Disk Agent and Media Agent. However, the debug.log file does not supply very much useful information, unless there was some problem with the IDB
I would also check the Applications Event log, and the System Event log on the Cell Server, Disk Agent and Media Agent. Sometimes, some other application, like a virus checker, for example, can cause something like this, especially if the failure happens at about the same time.
However, you will probably need to open a case, and implement debugging on the Schedule file to catch the error