I use BigScreenEPG to load the guide data I pull from the Internet. Recently I notice TV1 was out by an hour and a half and yesterday I noticed both TV1 and TV2 had stopped moving the EPG data and was 5 to 6 hours out.
When I load the EPG again it seems to fix the problem for a few hours then it starts over again and TV1 drops and hour and a half. A pain the A really.
I have not had this issue with all of the Beta's and RC releases. Only now with RTM and it only started last week so it was fine for the first two weeks after Windows 7 RTM release.
EPG data and timings are correct, No timezone issues, and it only affects TV1 most of the time and sometimes TV2.