I'm seeing this issue for a lot of people, but I am not sure what the solution is. Some suggestions are changing the HDMI cable, but I am using a Roku Streaming Stick + directly connected to my Sony TV.
When I am watching content on my Roku (Netflix, YouTube TV, whatever) everything is fine at the start. Gradually the audio will start to drop/cut out (maybe after 10-15 minutes) and then finally go out completely. The only solution I have found is to turn off the Roku for 5-10 seconds and then turn it back on. However this solution only works temporarily and the audio dropping/cutting out comes back, even more quickly and then the audio goes out completely again, maybe after a couple of minutes this time. I turn the Roku off and repeat the cycle, but it happens again, even faster. Eventually even turning the Roku off for a brief period doesn't fix the problem...and I have to leave it off for a longer period to "reset" it.
Seems to be a new problem...I don't recall having this issue in the fall when I was using my Roku...so maybe related to a software build (I am using the latest software).
It is very strange in that the Roku works fine for a while when I first start watching TV and then starts having the issue...but after the reset the problem happens more quickly. I would think that if there were a HW problem the issue would appear immediately and be the same every time...not gradually get worse the longer I am trying to watch the Roku.
Has anyone found a solution?