Problem #3 is frequently the result of a bad or dirty magazine. The top of the magazine—the feed lips—may be worn or the shape has changed through use. Also possible: The magazine was not fully seated (pushed all the way in) into the pistol; or the inside of the magazine is dirty, holding onto the follower so it can't push cartridges up smoothly. Solution: Try other magazines. If it happens with most other magazines, and especially with new, clean ones, the problem may be a rough feed ramp (but I doubt it).
Problem #4 may have happened because the gun was dirty. If you had used too much oil, the oil may have held onto dirt. This would slow the slide down, as it moves back and forth, causing incomplete extraction. Dirt might also get into the extractor's hook, making it malfunction. It is also possible that you relaxed your hold on the gun, for just that one shot (but I doubt it, because it happened only that once).
Let us know how things work out.