I just got the pps in 40cal. i have put 300-350 rds in thru it and at about 300 the slide would always lock back on me. i cleaned it and have also gone down in the gran from 185 to 155. the 155 didnt do it as much as the 185 did but still sucks if i had to really defend myself. anyone know what to do and also has this happen to any one??? thanks for reading this.