The guy in our club who's the DCC guru says sometimes decoders "get stupid" like our computers. Well, you can't just unplug the decoders for ten minutes and the thing get it's mind back, sometimes you need to remove the decoder and using a jumper wire short the two contact points together, erasing the memory, re-install it and re-program it and it will magically work, when all else fails. I've had a TV and a DVD player and a video camera all get stupid. Remove the power, wait a few minutes, power them back up and they work. During WWII, they called them "Gremlins". ???