I have a theory, +Scott Kelby
When Adobe added new video capabilities into Photoshop CS6 they added some new hidden features. You must have uncovered the all new "Mel Blanc filter" that is used to place portable holes
in crazy places where rabbits like Bugs Bunny can escape from whoever is after him. I believe that Photoshop knows the danger of leaving unattended portable holes
lying around. So, as a safety feature, it erases any holes that are not used for more than 30 seconds...