I have a problem sometimes with my 922 where I get audio but no video... and sometimes the "fix" for it is to switch to a different HDMI input for a second or two, then switch back and I get video again.
Try that next time it happens to you and see if it works.
I never thought to tie the problem to the OTA module (722K and 922 use the same OTA module)... but it wouldn't surprise me since that module has some other quirky things.
Try that next time it happens to you and see if it works.
I never thought to tie the problem to the OTA module (722K and 922 use the same OTA module)... but it wouldn't surprise me since that module has some other quirky things.