Locking in semi that's fixed by switching to auto usually happens when you release the trigger too soon after pulling it. Releasing the trigger too soon breaks the electrical connection before the motor has enough juice to fully cycle the gears and piston. Try holding down the trigger in semi to see if this is your problem. A weak battery, bad wiring, or strong spring can make the problem worse. Make sure your battery is strong enough for your spring and check for any kinks in the wiring.
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