Recently, my Bachmann EZ DCC Command controller stopped working - the digital locos will produce sound and the lights work, but the locos will not run, either in reverse or forward - it is not the case of having the wrong address, because as I test each loco individually (there are 5), I first choose the appropriate address for each one, then select the Function key, then test it's lights and sound - each of the 5 work for light & sound, but none of them run - I first removed all but 1 of the locos to see if maybe there was an "overload", but that individual loco (proper address selected) did not run, just lights & sound - any ideas?