P2 shuddering

[CrashMan]

My P2 shudders in forward flight and dropping altitude, it resonates loudly to the camera audio. It doesnt do it in reverse flight, hovering or climbing. Checked the screws, installed new props, no change. It flies as it should. The video is smooth. The noise when it shudders is very loud in the audio, by no means slight. Any ideas out there?

 

[thedjiguy]

I am not sure about shuddering, but when you fly forward at top speed or almost top speed, the Phantom will loose altitude quite quickly.