Is it the same jobs always failing or just random failures?
If the same file, then I would look to see what may be 'wrong' in the file. We had some fail due to Legacy Datums that had not been converted in Creo 7.
I doubt that you changed settings to not publish .drw files since you said it was random. I would look at your publishing rules since in the image it indicates you are using publishing rules. Perhaps there is a logic error that depending on state or some other attribute, you have not covered all cases.
The "No Processing Required" message is odd for a Creo drawing. It's normally reserved for object types that Windchill can't publish. It's probably worth opening a case with tech support to troubleshoot.