Hi, I purchased the Droid Razr M in March and have had no problems at all until now. I've recently found out that on 4g, when I use headphones or speakers or any audio device with a cable, I get this insanely annoying buzzing noise. Its not the headphones as other phones and an iPad have nice and clear audio and it is not the track either. It also is only on 4g. I've cleaned the jack and on wifi or 3g, the phone is completely fine to listen to. Then I go into an area of 4g and the buzzing noise just won't stop. This happens on streaming, mp3's on the device, youtube videos, movies. Everything.