Odd, I just started having issues with my horn last night. I noticed an extreme increase in the sensitivity of the horn "button" on the steering wheel. Used to be I'd have to press reasonably hard (maybe 5 lb/si of pressure) to beep. As of last night, if I just touch it (even like 0.25 lb/si of pressure) it will sound. I'm not sure what the switch is like under there, but I think maybe from pounding on the horn in Miami traffic I may have done something to it. Have you recently pounded on your horn?