This too has been happening to me as well. Use my 260 as QAM tuner with a Samsung HDTV (san QAM). One day all the channels of the NBC affiliate (3-1, 3-2, 3-3) are there
then suddenly gone. Has happened to other channels as well. Insight Cable re maps
the channels to there analog OTA (3 (NBC), 11(ABC), 32(CBS), 41(FOX) etc. Tried a rescan and still can't see 3-1(NBC) or the affiliate's other sub channel 3-3, only one
260 can find is 3-3 (weather service channel). Any thoughts?