What type of opener is it and how new is it?
I don't know what country you are in, but if I assume the U.S.A. than your operating frequency will be in the 300 to 400 MHz bands, and can certainly be interfered with but that usually results in poor long distance usability.
A poorly designed receiver can have front end overload and not deal well with strong signals, but with today's RF devices it is pretty easy to make a decent receiver unless you are really cutting corners.
Do you ever have any false openings, where you did not trigger it?
You can try to reduce receiver sensitivity by leaving the antenna wire inside the metal enclosure if it has one. That should reduce any signal overload issues.