Have you had the grips off of it? I don't encourage taking the left grip off (the one on the safety lever side of the gun or you may experience the $1000 chip) but if you have not had them off you may want to remove the right side grip to see if there is something mechanically wrong with the main spring and mechanism. It would be rare but is an easy thing to check. I saw one one time where the lever that the spring compressor is attached to had "bound". Repair was rather straight forward.
Gary
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