Has anyone had an issue with their SR22 pistol's barrel coming loose? This has happened twice and has not been a big deal. The first time happened after about 800 rds, and the second at around 2200. I just tightened it back up both times and will check it each time I clean it. It has not affected function or accuracy. The last time it felt as if it was nearly ready to come off. Just wondered if anyone else had the same issue. ( Forgive me.....I know there was a thread on this a couple of years ago, but I did not locate it)