My guess is that your cable company change them on you. Just go through and find your favorite channels and remember them. Good luck.
On my Sony T.V. in the TVGOS when you go to channel setup some of them like channel 4-1 keeps saying now tuning. Channel 4-1 used to work some of the channels like it still work and some don't. Also a couple of other channels don't work anymore CHILL channel 88 is one of them. and I also noticed a lot of channels are turned off and to turn them on you have to tune them which some of them like channel 11 I was able to turn it on by tuning it to 11, but entering the channel number in the tune spot doesn't work on all of them. Another channel I lost is ESPN classic it is not tuned. Channel 10 is tuned to 12-1 but it doesn't work. Channel 76.2 works which is HD of channel 4. Also channel 79.1 works which is HD of channel 5. I need help getting all my channels back.