Hi Rocket Man,
I have got the same problem and I'am looking for solution since I started, aproximetly few weeks. Hopefully I will find a solution beacuse of you. You posted that you find some flag in registry with some help from microsoft. Could you tell more specific about this flag you reseted and if this has got influenco sth else? Sysvol is missing automatically in about 10 days and won't repplicates anymore. I think this can be a bug of WS 2012 but I am not sure.
regards
lato90