Since you said it used to work, one quick thing you could try is cleaning the rails, all three (center and two outside). The DCS signal goes out on the center rail and the PS2 board in the engine sends back to the TIU thru the wheels contacting the outside rails and thus a path back to the TIU. Since the TMCC signal booster adds more interference to the ground rails, it makes it even more important to have a strong DCS signal back thru the ground wiring.
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