If the replacement coupler still opens on its own, it probably a grounding issue. I’m not familiar enough with your loco to make a specific determination. Inspect any terminals attached to the chassis or trucks. Look for anything that may prevent PERFECT conductivity. Double check the connection of the coupler wires. Look for corrosion, glue, paint, dirt, or anything that might cause an intermittent electrical signal to the coupler. Good luck.
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