I have the same problem. A while back, I had a few corrupt files that caused the transcoder to fail and crash Plex. That left plenty of evidence in the Plex logs to track it down and fix it, but nothing in Event Viewer. After updating to 1.28.2.6151, Plex started crashing again. This time there are no obvious errors in the Plex log, just the same Windows error as above in Event Viewer. Once a week at 2am or so. It appears to crash either during or just after the bundles are cleaned during weekly maintenance. I suspect this because the last thing in my plex logs at that time on the crash day is cleaning the bundles.
