I have two circa 2002 K-Line Pennsylvania #913 steam switchers. They both operate correctly on my home layout in TMCC mode. On my friend's much larger layout, one of them loses reception of the TMCC signal after traveling a short distance down the main line where several other TMCC locomotives operate correctly. The second #913 does much better, but also eventually also loses reception and stops. Does anyone know what the cause of this reception loss could be? A bad radio board or disconnected antenna? Any suggestions would be appreciated. Maybe it is time for an upgrade to more recent ERR control boards? Help!