Many automatic garage doors in Ottawa have suddenly, and strangely, stopped working, due to a powerful radio signal that appears to be interfering with the remote controls that open them. 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...