I just purchased a nib gen 3 27 from a local gun store. Not new to glocks. Owned several in 9mm (17,19,26). I fired 100 rounds of federal 165 grain target ammo. I experience 2 sporadic failure to feed on the last round. Rounds were partly chambered angled slightly up and slide didn't close. I also had one last round fail to chamber completely( slide returned to battery, round still in mag. I then fired 10 rounds of hornady tap fpd 155 gr. Last round failed to feed as well, round partly chambered and slide fail to return to battery. Any idea why? I took the gun right to the range after I paid for it, but I did break it down and added a little break free clp to the oiling points. I haven't experienced this with any of my 9mm glocks. I thought it may be limp wristing, but the failures were only on the last round, and I also fired a few one handed fine. Any insight would be greatly appreciated.