Guys I need you to weigh in on this problem. I have a g19 gen 4 bought last march. original extractor and ejector with the new spring assembly I got after the recall from glock. Gun ejects fine and never jams (Over 1500 rds) fired. The issue is that after putting a new mag in, the slide releases. It has just started to do it though not all the time. I shot 25 magazines with 10 rds . The mags are all factory from glock less than a yr oldand I have 10 mags . Six times out of 25 the slide relaesed upon the magazine seating. After the first one I made sure my finger was not near the the release. Gun is cleaned after each use and lubricated . Any ideas as to why?