Jon,
If you are calling in real cold weather, the metal reeds will freeze up on even the best enclosed reed call. If that is what's happening, you will just have to buy an open reed call like maybe a Crit'r call standard. A lot of die hard enclosed reed guys are carrying three or four calls as back up when the spit freezes up inside the reed on one of em. Some guys even carry a hand warmer in their pocket and keep their metal reed calls in where it is warm. I hope this helps you.