I have this exact same problem on mine. I made some blade/wire adjustments but it always seems to creep back. I have not been too aggressive with the switch yet as it has not happened in a while since the last adjustment, I think it needs to sit a bit lower, seems the angle of the wire above the table may be too sharp and creates a catch point if the ball roll is slow enough.
Try bringing the wire down a bit, the challenge is the switch is on the bottom of the playfield, so once you bend it and screw it back in you have to lower the playfield and test with a ball, it is quite the little pain in the rear, interested if you resolve it with an adjustment