Had a similar problem with a DE Flipper on lower right side of a TFTC. I was helping a friend. So he ordered a flipper coil rebuild kit. That did not fix it. Then he bought a new flipper board. That did not fix it. We finally figured out that the blade switch that the flipper mech opens was bent out of shape. Instead of opening at EOS, End of stroke. It was opening right away. We read an old DE bulletin about these switches failing and shorting out between the blades also. With a new blade installed and set up correctly for EOS, the problem went away.