I have put about 500 rounds through my Glock 19. I was at the range getting ready for a CCW class next weekend (6 & 7 of August) and my G19 started throwing brass in my face and the I had two failures to eject. It has the 04 recoil spring and has not never had an issue until now. Any ideas? I need to make sure it is working for this coming class. Thanks!