rollinbigrubbers

I hate to bring a dead post back from the grave but I have been having the same problem. My M2 is 2 weeks old I have shot 9 3" waterfowl rounds and 2 boxes of dove/skeet shot through it. No problem with the waterfowl rounds, but sometimes the 2nd shot of dove rounds will hang up, and also when loading the dove rounds I float a shell and pull the charging handel to the rear and the shell will get hung up in the action. I have no idea what is causing this, but I hope it just needs to be broken in. I have lightly lubricated the bolt rails with the supplied lubricant. Any ideas?