I just got a Samsung Galaxy S4 Active last Saturday. I love the phone, but I had a serious problem with it. When talking to someone, the other person could not hear me at all anymore after maybe 30 to 60s on the call. After 10s or so they could hear me again. It was like that on every single call. So I exchanged it for a new S4 Active. Now I can be on a call for much longer, but right when I thought it is working now, people tell me that they cannot hear me at all. Again, that lasts for maybe 10s or so, then they can hear me again. I am not changing my grip or position, so I really don't know what the problem is. Anybody else seeing this problem? Could it actually be that I got two phones in a row with hardware problems???