Success! Rayschic's suggestion was right on. Everything is now operating on a different code, different for each door. The transmitter that was activating mine by accident no longer does it. I really appreciate the help. Might be a good idea to reprogram these things on a periodic basis as a preventative measure. It's an easy process after you get the first one done correctly.
The excellent help on this board is appreciated!
"Thank YOU" to all who contributed.
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