I've had two gigs where my 4HH Bongo didn't work. Maybe it was coincidence, but both were outside in cold weather. It doesn't produce any signal whatsoever. I bought it new about 1 1/2 years ago. Cables are good. I tried replacing the batteries, but still no signal. I figure it would have to be something with the preamp. Has anyone else had this problem, or know what the solution might be?