Just took delivery on the PRR Lionel PA (1933191) and PB (1933193). After fully programing the engines, when placed on the same track with other engines already programed, the new engines will not respond and have to be reprogramed. The new programing works fine (crew sounds, signals, engine sounds, speed) until the unit is placed on a powered track with other locomotives, then the engine will not respond. Only happens with these two new PA/PB units. Any one else having this issue?