I updated firmware on my Inspire 1 w/X5 hoping it would improve the video wobble, drifting camera and jerky footage.  Well, I think the drifting may be better but I still experience a smaller jerky/wobble effect and a new very puzzleing issue.  Randomly the camera will suddenly drop about 20+ degrees.  See video below at the :05 mark.  
I'm using the Lumix 15mm lens, balanced with hood and filter.  You'll see the camera suddenly drop angle without any input.  Very frustrating this happened several times during my flight session on Monday.  Potentially very imbarassing if on a paid project.  Help dji!!

Try to do the lens and gimbal calibration. Does it happens only with 15 mm or other lenses as well?