My fixed bike has 1/5 of "freewheel" pedal rotation, meaning that i can pedal for a good 1/5 of a rotation without the rear wheel mooving. It has happened a couple of times. first time my local track bike shop fixed the problem, and now it has opened again. It has been provoked open, I believe, from trying to skid.
Did the lock ring unlock, whatever that means? Or the sprocket? How tight will I have to make these to prevent it from happening again?