I have a ~3 x 6 foot oval of RealTrax. There seems to be a power spike on one side of the power terminal that extends to the other end of the oval andthen ends. In other words, when left at the same power from the transformer, the train will at two different speeds depending on where it is on the oval. Does anyone know the cause of this and what I can do about it? Is the terminal defective? Or is there a problem in the way the tracks are connecting to each other? And if so, where is the problem likely to be? Thanks for any help.