2008 FLHT stock trans. 6 speed, currently about 4000 miles on Redline Heavy Shockproof trans fluid. The following is happening sporadically: At operating temperature, when downshifting from 6th down, with multiple operations of the lever, I get know feeling of gears. I will let the clutch out slightly, then pull back in and attempt to downshift again, and the gear feeling comes back. Does anyone have any idea what is going on?