I have the ROKU ultra 4K and I keep losing sound also. It seems to happen when I’m watching something in DD+ and then go back to PCM with YouTube? Luckily it fixes for awhile if I reboot but this 9.30 Build 4143 sucks for me. I’m also getting more then usual lock ups when viewing YouTube. Can you go back to the way it was a week ago?
UPDATE: Today I found another forum post about others having this issues and I did what someone had suggested and turned off the Sound Leveling and it worked. I have been watching Britbox for the last 2 hours and no issues. Hopefully this will solve the probem for others also. Hit the (*), then Volume Mode and set to off.
I have the Streaming stick, the program plays fine for 20 -25 min and then no sound or it's garbled. Reset the Roku and it's fine for another 20 min. It's not just one App, it's all of them, Netflix, Hulu, Britbox...everything. I have two TV's with Roku streaming sticks and it's doing it on both sets.
I checked the the software version and it's 9.3.0...said it was updated on May 5, 2020