I know this is a very old post but did you ever find the solution on your table? Mine has been doing it as well lately.
Quoted from The1JoshuaB:Thanks guys. I finally filmed a few instances of the problem. I think the lower rail definitely needs bending up a bit. The Port ramp seems raised a bit so the Starboard side probably needs a similar adjustment. Later today probably.
Anyway, here's a video with slow-motion for each instance:Pinball Soul - http://www.pinballsoul.com
My Blog - http://www.joshuab.org