MSD Garage door tango??

Try temporarily disconnecting the wires to the manual button, and see if it still does it.

Another possible fix: if the wires to the button are two side-by-side wires molded together parallel, disconnect them and twist them so they run in a spiral twist, maybe
4 to 5 twists per inch.
Then reconnect.
No foolin'.
This is how old 1930s "noise-free" radio antenna lead-in wires were made.
The reversals cause the noise pickup to be cancelled.
You were not in the EE school at Purdue, I gather.