Just today, went through 50 rounds of Winchester 40 S&W 165 GR. Full Metal Jacket with no issues. Took a break for lunch and then shot 5 rounds. On the next clip... the firearm failed to fire. I was able to pull back on the slide and eject the round. Next round failed to fire. After ejecting the round and trying different clips to see if the clip was an issue, the results were all the same. Sounded like the Striker released with a little "ping" and no fire. I then tried to disassemble the Slide from the frame. After removing the Striker Release Lever and pulling the trigger... I was unable to release the Slide from the Frame. Whatever is causing the blockage seems to have spring tension. What should I do?