There are several ways this can happen. I need more info to sort it out for you - Have you recently changed ANYTHING in your setup at all? Different guitar, same guitar with different pickup switching, different guitar cable, different position of guitar/amp, changed orientation of amp (North, east, etc) Had any power surges lately, sitting under Neon lights, sitting in different chair facing a different direction, ANYTHING at all. Can you hear the radio station well enough to catch the call sign and find out if it's an AM or FM station? Be specific, maybe we can pin it down... Steve