This is VERY odd! When you plugged the TMCC base back into the layout, did you have any TMCC or Legacy engines on the tracks? If so remove them and repeat the test. It is highly unlikely and improbable for the TMCC base unit alone to affect DCS. It has been demonstrated literally 1000s of times that TMCC and DCS are separate but compatible systems. That said, when problems do arise with the DCS signal, the chances of the TMCC engine being the culprit are extremely high. There are multiple, well known, documented instances with certain brand and model TMCC equipped engines not playing fairly with DCS. Bad TMCC bases, while possible, are extremely unlikely.
As others have stated, verify that DCS and the TMCC base are indeed working correctly together. If you cannot do that, no need to start dealing with the TMCC engines. You will get nowhere. Instead, try another TMCC base just to cover the possibility. You can also break things down to the simplest set up and connect DCS to about 3-6ft of track. (Put the track on the floor so an unplanned run-away does not launch an engine!) Check your DCS signal strength. Then connect the TMCC base (without a TMCC engine) and recheck the DCS signal strength. If all is okay, add a TMCC engine to the mix. If all is well, swap TMCC engines and keep testing until you identify all the bad actors. Bear in mind there may be more than one!
Chris
LVHR
