Hi all, New to DCC, using a Gaugemaster Prodigy express, fitted decoders to a number of Loco's. All working fine apart from a TTS A4 sound decoder, Sound works fine until the loco (Silver Link) starts to move, as I increase speed, when the speed reaches 8 on the cab, the loco stops, then starts again, then stops. The motor stops and starts regardless of sound on or off, idea it must be a CV that's wrong ( I have reset to 8, made no difference). Could it be Back EMF the problem