two days ago I noticed that half of my channels in my favorite list was missing, went in and re-checked the channels that were missing, all seemed good. The next day I noticed USA was missing, went back into favorite and re-checked USA, saved, exited edit. no USA in favorites, after trying two more times I decided to check USA and a cooking channel, saved, USA was back but cooking channel gone. Today TVLAND was missing along with one of my locals, after re-checking TVLAND and my local several times and a cooking channel they appeared in my favorites except the cooking channel. Any ideas why this is happening?