I recently got a line with T-Mobile (Galaxy S7). So far the speeds and coverage has been great. But at times, I would have calls and texts not coming in. At the most, texts would come in an hour later. I've also have been told by people of why I'm not answering their call, and that's because I don't receive calls. It only works when i call someone. Anyway this could be fixed? This has been happening a lot lately..