I have seen that - when it happened I arrow ed back up to cable/ antenna - selected antenna then selected search - cancelled out - re selected cable and was ok - like it got stuck in a particular setting
I also found that if I have the power on to the over the air antenna cable will not work
It is like my tablet when it acts up - not sure what fixes the problem after fiddling with it - but eventually it works - drives me crazy because I never really know which thing I did to make it work
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