I was shooting my G17. After several strings of fire, the trigger got hard. It went from 5 1/2 lbs to like 9. It ruined my string. I took the slide off and looked at the connector and jiggled the trigger bar back and forth a few times. I put it back together and it was back to 5.5lbs. Then 3 strings later it went back up to 9lbs. Took it apart again. Put it back together. Back to 5.5. Got home and took the reciever apart examining all parts carefully and everything looks good. I have owned several Glocks and this has never happened before. What do you all think is happening? All parts are stock including the connector and spring. Please help. TYIA.