I was shooting magtech .357mag. I've shot a couple hundred rounds. I clean it after each use. But yesterday I couldn't get the cases out,without using a rod to push them out. The ends were flaired a bit. But enough to Keep them in that it took a good push on the rod to get them out. Why is this happening,when it hadn't before? Do I need a "tune up", polishing etc??? Thanks PS... 38'Specials are not a problem to get out.