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John,
I had the same problem, inside the motor is a set of brass spring contacts that rub on a brass plate attached to the gear mechanism, which in turn is hooked to the motor. The brass spring contacts have lost some of their "springiness" and probably have twisted somewhat in their track. I was able to get a couple more months of service by some surgery on the ramp that causes the contacts to jump the surface - thus electrically signaling the end of cycle. When it jumps track there is no end of cycle signal received so the system freezes in whichever state it finds itself - locked or unlocked. Resetting power (pulling the fuse) in effect performs the reset. In my case I eventually bought a new motor/lock mechanism as the only long term solution.
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