This all started when a wire came off the flipper coil? Could be a bad coil. You symptoms suggest the EOS on one or more flipper coils is not wired properly. Check the 'random' brown wire and make sure its wired so the EOS shorts out the holding coil and opens at about 80% of the flipper stroke. Dual flipper games have 2 EOSs on the lower flipper. The EOSs should be wired break-make.
Finally, test the EOS adjustment by pushing in the plunger with your finger and not by turning the flipper it'self.