I have had my phantom for 2 weeks now and have flown it a handful of times. Today, I noticed I was having a serious throttle issue. The issue is, the engines stay at about 15% from the bottom of the stick to halfway. At just above halfway, the throttle increases, and quite dramatically. I am also getting a double green led Flash when in gps mode, and a double yellow flash when in ATTI. The only thing I have done differently is add the gopro to the bottom. Wifi is off. I also just recently added carbon fiber props. Does this sound like a gain issue? I also have done a full re-calibration of the controller, and in the naza software, all axis are moving correctly. Any suggestions on how to fix this?