I've noticed my audio keeps reverting to TV speaker. I have to keep resetting the TV each time to get both the TV and soundbar to work together!
I've got a HDMI cable going from ARC on soundbar to ARC on the one connect box and a PS5 to the One connect box.
Why does it only work once I reset the TV each time?? Everything is up to date so this is extremely annoying!
I have exactly the same issue with my new 65" QN95A. it worked perfect for about 1.5 week before I strted to get the same problem as you. I have tv hooked up to a HW-Q950T soundbar. when this happens I always hold the I/O button on the remote for about 6 seconds so the tv restarts. then it will work perfect, until the next time I want to start the tv again... so approx 1-2 times a day. weird because it worked flawless for 1.5 week and then suddenly it started to do this. have not changed anything in settings or setup..
samsung support told me to test if some of my other devices struggle via HDMI 3 eArc. if so, then it may be something wrong with the port.
glad it's fixed for you.
I do not have the same luck..
I got this problem starting only tv and soundbar with no other device started. all cables are certified 2.1.
so this is something with the tv I think since it needs to be restarted before it works again. hopefully just a software bug.