FIX FOR BALL FALLING OFF RAILS AS IT CROSSES PLAYFIELD FROM CENTER RAMP:
I have seen several people with this issue and I had the same on my LE. Took a slow-mo video of ball and noticed it was riding the right rail as it came around the curve just below the Strange disk... sometimes would fall off and sometimes not. Take a look a photo below of my fix. Use a cloth to protect the rail and a pair of pliers and bend the last part of the guard rail to the left (towards back of playfield) ever so slightly. Not much is needed, but you can visibly see a few degrees of bend in my pic below. Fixed 100% of the time now. EDIT: Worked for me, but as always, bend at your own risk.