I have had this happen a few times now. I use the MRC Prodigy Advanced system, and one in a while the locos just stop responding. They just keep marching right along. I turn the power off and get the controll back, but thensome times I loose it again. Then this will not happen for a long time. Has any one seen this?
Make sure your decoders are set to run on DCC only. The default value for the decoder is to run on analog and DCC. That is why you have the problem you're experiencing. You have to change values in CV 29. Stay cool and run steam......