check that your shaft is going far enough into the coil to solidly hit the coil stop. I had this same problem. My rebuild flipper links were hitting the front of the coil and stopping the shaft from making solid contact with the coil stop. Trimmed the pawl link with a box cutter to allow further travel and cured it instantly. Was sent wrong ones in my rebuild kit. Was sent rounded but need tapered for my firepower.
Jack