Hi everyone! I have just bought brand new Nike+ 42 mm last Friday. It's good. Unfortunately I have got a ridiculous problem today. In evening I had checked it which battery was showing with 27. After 10 minutes later I got some notifications and it was showing that it had 6 battery percentage left. Have anyone ever met this problem? If you are, does it occur again after that? I'm still in 14-days returnable period. Should I request a replacement unit?