If your running TMCC, one track over or under another, it’s signal issues my guess. I had this issue when one of my TMCC engines ran under another TMCC engine many years ago..We solved the issue with ground plain wiring. Running a wire from the middle screw of an electrical receptical to a terminal strip. From the terminal strip we ran wires under the upper level tracks and that flattened the signal causing the problem. Give that a try...
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