I have an LG tv, a play bar with a sub and two play 1’s as a surround setup.
The Playbar is connected to the tv via optical cable.
The tv has a sky box and a ps4 connected to it via HDMI.
The sound bar works fine 100% of the time when it is playing direwctly from the TV, however when I switch to a HDMI source, sometimes I get a fast beating noise where the sound is constantly cutting out and back in again.
This does not happen all the time but if the tv is one for a few hours I can guarantee that it will do it for about 30 mins out of that time.
I have replaced the optical cable already so its not that. All the tests I have done so far point to the Plaaybar being faulty. (The fact I get the same results on multiple HDMI sources).
Can you help please, this is really annoying I'm having to switch to normal TV sound have spent a fortune on a Sonos system.