Not sure if this is common or not but I sometimes experience a loco not getting the memo while in consist with other locos. This will sometimes manifest itself as one of the locos still running when the throttle is set to zero or, if a sound unit, maybe the dynamic brakes not shutting off in one of the locos. This probably has more to do with my still-far-lacking number of track feeders more than anything else, but I seem to recall that some DCC systems operate differently...with some systems sending command "packages"(?) repeatedly until rec'd by the decoder while others possibly do not. Is this indeed the case?