I recently purchased a S4, and I've been getting intermittent Sim Card errors, they usually don't last long about 2-5 seconds, but its typically when I'm in the middle of talking to someone on the phone, or on an app that uses the internet (maybe not so typically but i'm not using the phone so i don't see it). I called the Best Buy store it was purchased from, and they said it was a sim card issue and to come in and have the card replaced. When i got to the store (which is located in a mall) they sent me to the Verizon wireless Kiosk, who replaced my sim card. Unfortunately the issue continues to happen, which is extremely frustrating... any thoughts?