I generally run an hour everyday with my iPod Shuffle. After 1 month of use the headphone controls were no longer working. I decided to use the pair that came with my iPhone since they also have volume controls. Today these started acting up. Has anyone else experienced these problems? I am guessing that sweat is entering the controls and now making them unusable. I love the size of the iPod but this is presenting a major problem for me. Any ideas?