I have a Glock 23 Gen 3, and was at the range today. Today was the first time I had shot it since Nov 2011. While i was shooting, i had a few issues come up that i never experienced before. while going through a magazine i would fire and the brass would be extracted properly. then the next shot, the slide would stay racked back like it was empty...but it wasn't. so i would slide it forward and go about my business. this happened maybe 3 times. not sure why this would happen. never happened before... the next issue is that it wouldn't stay back after the last round was fired. i would shoot my rounds down range and then i would fire with no result..so i kept it pointed down range just in case it was a delayed fire..or whatever. next i would drop the mag and pull back on the slide...nothing. there were no more rounds...it did this 3-4 times...and it was aggravating and embarrassing. i was the only one on the range at this time so the range master was behind me and i heard him at one time say to himself "wow" after the 3rd time of not firing due to no round. so whats the cause? i've put about 500 rounds through it when i got it in oct 2011. and put another 75-100 today. would extra lube prevent this? i don't fire my guns wet...and usually little to no oil. i broke it down to inspect it and didn't notice anything. i did however see the firing pin slightly poking through after it was taking apart. i just pushed it back in...never noticed this before as well. would like to fix this problem since it is my EDC. don't want this to come up when **** is hitting the fan. thanks in advance.