We have 4 roku ultras. 2 from 2019 and 2 from 2020 (the latest model).
We never have a problem with the 2 from 2019, it's the 2020 models that lose sound after they've been paused, and it's happening more and more frequently, and it's annoying. We have to reboot the roku, then go back to YouTube TV, go back to the app we were watching, and then fast forward to where we left off.
I'd trash them, but we have the ultras simply because we can hard wire them. I'm going to see if there's a way to hard wire firesticks or some other streaming devices. I certainly won't change a newer model of the ultras if and when they're released.
EDIT: is anyone having the same problem with the Ultra LT?