I had the same problem with both of my Sears units and finally determined it was a local radio tower causing interferance. The tower was there for abouit two years and was used by the state police aned other local agencies. The radio tower was moved about 18 monts ago and now there is no problem. To get around the issue I installed a transmitter and receiver from Skylink Technologies that operated at 305 mhz instead of the 390 mhz that the Craftsman units use.
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