So had a weird one in 5.3 yesterday,  Did KEWR-LLBG in real time which was spectacular.  Landed at LLBG but as soon as I departed the runway the QW787 started rocking uncontrollably.  Made it to the gate and the plane started hopping until the point it rolled on it's side.  This was sitting completely still trying to set the parking brake.  Eventually I got so ill to my stomach from the screen jumping all over the place I just Alt-F4 and shut down P3D.  

Has anyone else seen this?  Does anyone know of a fix?  Thank you in advance as always for the time and any assistance.

Found the solution after searching a number of old threads via Google.  Turns out this is not new.  The issue in my case was EZDok EZCA latest version.  

https://www.simforums.com/forums/ezdok-bouncing-issue-p3d-v4_topic59259.html

Apparently the turbulence features in EZDok were causing the plane to rock uncontrollably on the ground.  As soon as I set the turbulence features to 0 the issue went away.  I am now rock solid on the ground at LLBG.  

If you find your plane rocking uncontrollably on the ground and have EZCA check the turbulence settings under effects.  Glad to have this resolved.