I have a model 41 Smith I have shot for years. I almost always shoot CCI Standard velocity ammo in it. Recently I have been having trouble. I am in a league where I have to load 10 rounds in the mags. Sometimes they will shoot all ten rounds, sometimes on round one or four a round will chamber but the gun will not fire. I can eject the round, put it back in the mag and the rest of the mag will fire. Could I possibly have a recoil spring issue? It has been recently cleaned and I have the same problem if I load 5 rounds in the mag or 10. Also it happens on several mags, so I don't think they are the problem. Any suggestions will be appreciated.