I have the new Legacy H10 6-84948, and it demonstrates an audio failure after running 10 minutes or so. Of course I assumed it's probably the audio board. However, at York I picked up another Legacy H10 6-84952 for repair with an audio issue, turns out it does EXACTLY the same thing! So, I was just wondering who else has observed similar issues.
My issue is at first the audio cuts out momentarily and then comes back with a much softer chuff sound. If I move the speed knob, the full volume chuff comes back. This goes on for about 10-15 minutes and then it kinda' goes nuts, see video. Note that when it's doing it's crazy sound dance, the marker lights are also going on and off, it seems like this is affecting the whole audio board power supply. Note that it does this with or without a battery added, it's not track connections. Since it also does it on my test rails with the clean rollers stationary on clean track, that's simply not a realistic possibility!
This also happens in an identical fashion to the one I have to "fix", but I'm not entirely sure what the fix might be. The chances of two audio boards having exactly the same hardware failure seems pretty small I would imagine.
FWIW, I installed a different RS-Lite Legacy board I had in my parts and ran for over an hour, and never saw this issue. Obviously, the sounds of a Cab-Forward coming out of the H10 weren't what I want, but I just wanted to see if it would narrow down the issue to the audio board.