I have a new five-seven the first 3 mags fired flawlessly. After that the gun fires a cartridge but fails to eject or feed and leaves the fired Brass case in the breech but does set the hammer so the next time you pull the trigger the hammer comes down on a fired case. If you cycle manual it ejects and feeds another round. Anyone out there got any ideas before I contact FN to get an RMA number. Like I said the gun is brand new. Thanks in advance.