On Windows 10 PC whenever I leave it for a while and the PC sleeps for some time the Khadas will lose connection and no longer show up in the playback devices. The only way to get it back is to unplug and replug the USB cable. Even restarting the PC once it’s disconnected does not bring it back.
I’ve never had it drop while using it. And I tested letting the PC sleep for 10 minutes and it was still connected after waking, but when I leave it overnight for example it is always disconnected.