I would not call static, but apparently I'm having the same problem; Some time the audio began to have interference, especially when I turn off the screen, already tried several things but still keeps happening. The strange thing is that happens only in the Poweramp, other players work perfectly. My smartphone is a LG Optimus 4XHD (P880), coincidentally the same case manufacturer above. The P880 is known for the low power audio output, however, use it since March 2012 with the Poweramp, and feathers in recent months'm having this problem. I've uninstalled everything I could, and had no effect, and also no other program has any problem.