Mine does the same thing after I upgraded the coil for the right flipper. I went up a little bit in strength. I saw another thread where guys put something on the ramp like tape or something to slow the ball down right before it gets diverted to the wire ramp. Mine only seems to do it when I hit one or two ramp shots in a row and the ball has extra speed going up the main ramp. I tried adjusting the ramp that didn't help. I may need to raise the pin a little to slow the shot down.
Joe