It's hard to post a question when your not sure what to ask. But here goes the ramble, I'm having issues with a Digitrax DH123D mobile decoder that will at times turn the led lights off when running in either directions. This loco has no sound. In addition I have a BL QSI 1 that will at times not allow control of the lights, bell or whistle. Although motor control in both directions seems to functions good on both engines although at times adjustments to the speed seem to be a little slow or like it takes a longer time for the engine to see the change up or down. Emergency stop works fine so far Oh yea. The controller is a Digitrax SCFXD Radio. I have a feeling that I have track issues as I'm converting a DC system on Atlas Code 100 snap track to DCC. I have added additional rail wiring for each 10' of track and insured that rail A and B do not cross and done the quarter test as recommended with good results. I can program and read the decoders on the program siding just fine and can change address's as well as reset the decoders to factory defaults. It's just during the running of the engines that lighting and sound issues arise. All the lighting is LED and the ma draw is set to 10ma with loading resistors. I don't think that there are caps on the decoders. I'm not sure just what they do although I have read that they improve decoder function when there is questionable rail connections. If it was a constant issue it might be easer to resolve. Any and all thought are welcome......solder all the connections ???. Ah get a new engineer or at least the fireman. We having fun yet !!!