Since some time now I have a very annoying whine in my video's that I caputure with the M2. Didn't had that in the beginning, but now in every video I take with the phone. I made a testvid: you can hear it the first 5 seconds, but most in most footage its there the whole time. Also, when I call someone, there is a fair amount of static noise. The other person hears me fine.