First off, I want to say I am a long time Roku users and currently have may products which work well and I enjoy. Recently I switched out mu previous model ultra (4660X2) for the new 4800 model to get full support for Dolby Vision and Dolby Atmos. Since then I have had problems in two areas which seem to impact others.
1. When a streaming show starts up initially or after a brief pause, the show starts but the audio starts up 1 second or two later.
2. If I paused for more than approximately 2 minutes, when I un-paused the streaming service (doesn't seem to matter which one, I verified it happens on Prime, Netflix and HBO max), audio doesn't come back on. I f I try to switch the TV input, everything freezes and the TV (i think also the Roku, but am not sure) reboots. After which I am back to the same boat (audio start lag, and can't pause it for more than 2 minutes. I have tried different cables, factory reset, changing audio settings, nothing works. The old 4660x2 ultra works fine if I swap it back.
My setup is a 2018 VISO Quantum X set, and VISO sound bar, surround system with Atmos.
During my latest attempt at trouble shooting, I noticed something interesting. When trying my third HDMI cable, I noticed the hard surface the Roku was placed on was very warm to the touch (102-105 F?). SO on a hunch I tried something. I put the Roku on top of 2 inch long small plastic risers that were one-inch high (just on the outside edges) to improve air circulation. Wow, what a difference. Almost no audio startup delay on stream start. And now I can pause it for over 5 minutes and unpause- no problem with audio coming back. I even went 11 Minutes on pause and audio came back fine (although it locked up the audio with a loud buz when I tried to rewind). I also noticed than in normal operation the unit now stays cool, but stills warms up a bit when I pause for more than 1 minute or so.
This makes me wonder if some of the similar problems people are having with the 4800s are related heat in some way? I'd be curious if any of you who have been having these types of issue would try to see if doing something to improve heat dissipation makes any difference.