I have been having audio problems between my Xfinity X1 DVR box and my TV. The TV is a Sony Bravia KDL-55EX640 with 4 HDMI inputs. The DVR is hooked up to HDMI input 1 using an HDMI cable that I already owned. It wasn't a cheap one and might be slightly longer than the standard cables given out with the DVRs. Also connected to the TV is a Roku on HDMI 2 and a BluRay player on HDMI 3. The Roku is normally powered. The BluRay is normally off.
Sometime last fall I started having audio problems. Basically, it worked at night, but then did not work the following morning. I first discovered that pulling the plug on the DVR fixed the problem. Then I discovered that resetting it through the Xfinity Account app fixed the problem. Then I figured out that if you just tell the remote "Help", it opens the screen with the reset command, and that fixed the problem. It does work if, once it is working, you turn it off and right back on. It does not usually work if it remains off for more than a couple of hours.
Because of the pandemic and weather and perhaps a bit of laziness, I did not try to replace the box until this week. So I go and get a new box, swap it - all the shows are still there! Way to go Comcast! - and the next morning, there is no sound. So now I know it wasn't the box.
Since then I discovered (but haven't verified that it ALWAYS works) that if I just switch the input from the DVR to the Roku and back, it also fixes the problem without having to reset the DVR. And just now I figured out that simply pulling the HDMI cord from the TV and putting it right back in also solves the problem.
Keeping in mind that this exact setup worked for years without a problem, my question is: Did my HDMI cable go bad? Is there a problem with the HDMI input on the TV? Is there some setting on the DVR that might cause this weird behavior AND stick with my account so that it caused the same problem on 2 boxes? The easiest thing to try is to switch the DVR to a different HDMI input on the TV and see if that solves the problem. I can also change the cable, but that is a lot more work.
Has anyone else had a problem like this??