First: Temporarily remove the body shell and leave it off. Test drive without the shell. See if anything changes.
Possible causes:
1. The DCC board frame contacts are not making good contact with the frame.
2. The opposite problem which it is something is contacting the frame where it should not be. Use Kapton tape to make sure things that should NOT touch do not.
3. the motor tabs are not making good contact with the bottom of the decoder.
4. the motor tabs are somehow touching the frame. Use Kapton tape to make sure things that should NOT touch do not.
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