Lost TV Channels

[starrrrman]

My TV channels have stopped working.
The movies are fine and still work.
Just recently this occured.
Any help would be appreciated.
Thanks

[starrrrman]

Just noticed something - if I go into the inner prtal settings and then go back to the tv channels the first one or 2 channels I select will work but then nothing after that
no regularity to it as sometimes have to try numerous times to get to work but the same result
anyone had a similar experience with the 256?