During the past couple months I started having feeding issues with my 6.8s. All my mags are ASC and I've had them about three years. I have two 15rd and three 25rd mags. After an aggravating day at the range I inspected all the mags and found they are all bulging when fully loaded. This is causing the follower to bind up. After I strip a least half the rounds out they start to feed fine. When I bought the mags I gave them the customary tweeking and they all worked fine until recently. I always keep them fully loaded until I empty them at the range. Is about three years the life span of an ASC mag?