Took my new M9 to the range for the first time yesterday. I was impressed with the gun except for one thing. A few times while I was shooting I noticed that if you press the trigger and hold it back as the gun fires---then release the trigger to feel the reset like on my Glock---sometimes the trigger will not reset. What causes this ??? I only shot a few mags through it and found the trigger would reset if I released the trigger right after it fires. Hope my despcription does not sound too confusing. Any help would be greatly appreciated ! One more thing---if the slide is locked back and you have your finer on the trigger---then release the slide it does not want to reset. Should I have major concerns right about now, or I am just too used to shooting my Glocks ???