wanted to post my findings after doing a complete factory reset on my premiere+ and setting it up as a 1080p device from the start.
Initially everything was working correctly. Then after shutting everything down for the night and coming back to the show I fell asleep to this morning, I thought my brand new sound bar had blown a speaker already because stereo sound was fuzzy and distorted, and there was no sound from the movie in Plex with surround I have on Deck. So here is what I see initially happening is: if I'm going on a fresh reboot things are OK. If I have been using the ROKU for a while. and then turn off the TV and sound bar, and let the ROKU go into stand by, when things come back up there are issues and either no sound, or distorted sound. I am not really able to provide a specific time frame here, so I'll just say extended periods of idle time bring on the issues, where as short periods don't seem to.
I was able to confirm my stuff, and the content are fine, by switching to another device, where playback and sound all returned to normal.
I have ruled out bad settings and a factory reset and still experience the same issues.