So I'm having a strange issue with my sound bar, going through the E-Arc port in my LG CX-55.

Randomly it will decide that it's not on E-Arc, and not give any audio. What I discovered was if I unplugged another HDMI cable going into a different port (and I tried ports 1 & 3, 4 is my 4k120 hz port and going to my PS5), it would work. If I plugged that cable back in, it would stop working.

I did change the cable, and it's now working all the time, but I can't figure out why an HDMI cable going into another port would stop the sound bar from working on e-arc and providing audio?