this answer won't make you that happy but it is the truth: blue tooth is not designed to penetrate a person's body. on those bumpy runs and high-movement cold days try to carry your phone/mp3 player on the SAME side of your body as the transmitter in the helmet and also higher up on your body. It should cut out the interruptions a bit. Also, try not to move so much (kidding)

I have this helmet with the plantronics bluetooth and mine also cuts in out sometimes. It seems to skip usually when its cold (25f or colder) and if its a bumpy run or on a landing (off a kicker). I think its just something we have to deal with. Smith support was NOT very helpful and just had me chasing my own tail for help. Other than that, its warm, safe, and efficient. Can't complain (too much).