hi, just installed tsdz2 on my tour easy, and display has full function when everything connected, but about ten seconds after i start pedaling the motor power cuts off -- no change in the display, so it appears all the connections are still sound. i didn't install the speed sensor, but this is my third tsdz2, and on the other two i didn't install the speed sensor on the bike. any advice on why power might cut off that way on this installation? if i power off and then on again, i get power assist for about ten seconds, just enough time to work my way through a few assist levels to check system function, but then the motor cuts off again. thanks for help, jeff