Mine ran great when I put it in and then after sitting on the shelf for awhile, I ran into this problem. I don't know why it took awhile to surface.
I actually ordered 2 of the R4LC boards...$80. A friend may need one with a similar issue.
BTW, I figured out the sound problem was the sound card. V2.1 if that matters. I replaced it with another sound card V2.1 and then exchanged the feature chip in it to the one I wanted to use and the horn and bell are solid now.
So a sort of design issue with the R2LC and a faulty sound commander board.
Anybody know what the issue is with an Electric RR V2.1 sound commander board that seems to lose it's features and sometimes doesn't always program correctly? The feature chips which are 3.11 and 3.25 and both work well in a good board. I'm looking for another sort of design issue 
. One thing I find odd is when I press "5" to shut the engine down, the sound goes away instantly. I don't think I have any other TMCC engines like that. The others seem to take a few seconds for the sound to quit.
