I bought the ez track crossover and my broadway and proto2000 locos derail every third or so trip around the track if the loco is to go straight.  If it is to go through the switch, they run fine.  It looks set and does not move when it try to make sure it is flush.

his is DC.  if I take it apart, will I void the warranty?  Is it something I could repair?

I bought a CSX GP38-2 DCC on board for my son and tested it and it worked, the next day he went to run it with a Bachmann transformer and he said it sparked and smoked and now it hums but does not move.  Other trains work on his track.  I put it on my Digitrax layout and it shorts the digitrax and shuts it off.  What could be the cause?