Hello, I need advice: I have a Samsung Galaxy S3. It's been happening to me lately that I'm calling someone, talking, hanging up, and in a few minutes the person I called on the phone is calling me back and asking what else I wanted. But I didn't call anymore. This missed call is then repeated to the same person once more. Sometimes he does the opposite. Someone is calling, and shortly after the appointment, the same person I spoke to will start calling again. But the person did not call. What can it be? Thank you for the advice.