Yup I have had the flex watt buzzing in my case it was a broken partial connection re do the points where you hear it and keep doing it until the sound goes away. If you are like me I couldn't do one at a time and ended up ordering new flex watt and doing the whole thing again and then trading the new for the old. I couldn't pull out one length at a time to work on it and pulling the whole thing left snakes with out heat for a very long time so I had no options really but rebuild the whole works. Oh well in the end it was much better I didn't wire the fist time around it came with the rack I bought used it is much more energy efficient now. (better wire and perfect connections saves line loss)