Help diagnose these failures.
Out of about 100 rounds, I had two types of failures, three in total.
1: TWICE, following firing, the slide did not move fully forward. I looked into the pistol, and saw the new round partially into the chamber. I whacked the rear of the slide with the palm of my hand, only to bruise my hand. It was locked up solid. I whacked the bottom of the magazine, and racked the slide back, only to find that the extractor had not yet engaged the partially loaded round. I had to pull the mag, and clear the jam. The locked up round showed no signs of deformation.
2: ONCE, following firing, the new round was "stood up" behind the chamber. The nose of the round was up against the top of the chamber, and the slide was as closed as it could be. I pulled the slide back, and gave a "uumph" toss right, the round flew wide, and I continued to fire.
The failures were on two mags, and I do not believe the same mag each time. The failures were near the end of about a 100 round firing session. At the beginning of the 100 rounds, the pistol was pristine clean. The failures were noever the first of last rounds in the mag. They were in a string of fire.
Any thoughts on common causes of these types of failures?