Abnormal Vibrations

The drone is seeing abnormal vibrations and could lead to a crash if not addressed. 

Cause:

1. There is a prop not properly installed, and or damaged.
   1. Could be due to mismatch, wrong alignment, or bad prop gaskets.
2. Another cause could be your motor mount is tilted or has some play to it.
   1. The motor mount screw holes can get loose and cause this issue.
3. The arm has an imperfection in it.
4. The arm is not securely tightened, or the locking handle is loose.

Diagnosing:

1. Check for imperfections within the arm and its components.
   1. Somewhere within the arm you will find an underlying issue. 
2. Check the frame to make sure there are no imperfections around the arm.
3. Make sure all screws for motor mounts, and arm locking handles are secure.

Solutions:

1. Replace Props
2. Replace Prop Pads
3. Replace Arm
4. Replace Motor Mount

Conclusion:

A good inspection should lead you to finding the fix, every situation could be a different item listed.