DO report it to SCS. It’s a known bug, but until they can reproduce it, they can’t fix it. The more bug reports they receive on this, the more likely they will assign more resources to it.
Someone on the Sony forums tried to tabulate the problem to discover any commonality between occurrences, but he found that there is NO common factor. None.
Steve Mann
MannMade Digital Video
http://www.mmdv.com