First time post here... I've noticed an issue begin to creep up with my Phantom. Upon takeoff, things are solid in both ATTI and GPS modes. But by the end of the flight there is a slight drift (usually towards 5:00 - with 12:00 being straight forward). This can be seen in both ATTI and GPS modes with a recent IMU flight calibration. A couple of notes: -There is a slight chance that this is wind. It's the type of movement you would expect from wind - pretty subtle. But it does this in GPS mode which should fight any wind. It also does it at 2-3 feet off the ground where the wind should be minimal. -While learning, I did take some big crashes. One led to a Error 25 and some Naza unit smacking to reset it and one slightly bent a motor inward (I think the shell is actually slightly bent.) I placed a few rubber washers under the motor to balance it out. While this might cause the unit to move a little strangely, what's weird to me is that it seems stable at the beginning of the flight and only goes drifty at the end. Thoughts?