I have problems with BT crashing after sleep. If I keep the device awake with the option in developer menu, there's no issue, until the box sleeps for the first time after which the bluetooth_manager is constantly crashing only to be restarted every few minutes. It doesn't matter if I use a PCI RTL8...

I have the same problem. I've tried updating to a v21 kodi release and it seems to help; I also don't seem to have as bad of a problem with Jellyfin, but yeah I'm getting the same dropouts.

I get a similar dropout playing music when the visualizer changes modes.