J.P. Cleroux of Ram Overhead Door Systems says the phenomenon began last weekend.
"It affects a 25-mile radius. That's huge," said Cleroux.
Angolan Ambassador Miguel Puna's operation is one of those affected by the problem. He can no longer open his embassy's electronic gate.
"Not only in this gate, but even other gates, we are having a lot of problems," said Puna. "This could cause security concerns."
Two companies that have plotted the reported problems on maps say they appear to cluster in the Byward Market area just east of Parliament Hill, and a corridor leading southeast from there.
The signal is transmitted on the 390-megahertz band, which is used by virtually all garage door openers on the continent.
That's the same frequency used by the U.S. military's new state-of-the-art Land Mobile Radio System.
Could the U.S. Embassy's CIA station be testing an experimental device to disable car bombers by locking their cars inside confined areas? Or is it something far more sinister than we could possibly imagine?
Imagine an entire city paralyzed because people can't open their garage doors.
This is serious stuff they're playing with.