Have a problem with my Bachmann EZ-turntable. It is chipped with a Bachmann DCC chip and generally works fine.  However, it will not operate the loco after a 180-degree turn. I can drive on and drive off at several points where I have track but if I try to turn the loco through 180 degrees there is no power to the centre turntable track. Power is still there on the input and if I go back 180 degrees no problem, power to both inlet and opposite exit road and to the centre track.  Likewise when back 180 degrees if I move the turntable to the first left or right position there is power but back to the power inlet - nothing to the centre