I was out driving last weekend and honked at another M3, or at least I thought I did. Loud music, car noises, etc. I figured they drowned out the sound. Then this morning I pulled into the parking lot at work and honk at a co-worker and I get an abbreviated honk and then nothing. I hit the horn a few morn times, nothing. So I check fuses 5 and 55, they're good. I try the horn again and it honks but cuts out again. Then nothing, again. Any ideas?