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Take out the hammer and take a picture of it. I'd like to have a look at it.
There should be two notches on the hammer. If the middle-one is worn down, it will cause the full auto effect. I've noticed this occuring mroe on guns that have aftermarket ALUMINUM hammers with upgraded hammer springs. The problem increases if the sear has been replaced with a steel one.
One way to test if the middle-notch has sheared off: do a slow manual hammer drop. (with your thumb releasing the tension after pulling the trigger.) If the notch is still there, the hammer should be only able to drop half way (unless there were modifications done to the hammer to do a proper working manual release.)
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