I have a rugersr9c. I installed a ghost rocket trigger in it and have been very happy with the weapon. Recently, the trigger has not been resetting and i get a misfire. I eject the bullet in the chamber and the next time I pull the trigger it fires. Last week I shot 100 round at the range and got about 8 misfires or the trigger not resetting. Took it to a gunsmith but he can't find anything wrong with it. Any advice would be appreciated. The gun has about 1000 round fired.