during the 'flashing black' screen issue, is audio interrupted? does it go and stay black? this is usually an issue with an HDMI cable bad or no longer seated properly at the set top box or at the TV end of the same HDMI cable.
@Rustyben-the audio goes out when the black screen Flashes. We have changed out the hdmi cord from the cable box-do you know why it would be fine for 2 days when the cable line was switched from the outside box To the house But the started again 2days later? We had a similar occurrence when we switched the hdmi cable from the cable box.
how is the set top box connected to your TV? do other set top boxes in the home have the same problem or are they ok while that one is having problems?
Hi-We have multiple boxes none with this issue.
pick one working box and swap the set of set top box, hdmi cable, power supply from one TV to the other and see if problem moves.