I've just got a Surface Pro 4 i5 and when it's charging, the battery icon animation works and shows the battery filling for about 30 seconds and then freezes. If I click on the icon the percentage and time to full charge also remain frozen, but the battery does charge normally. As soon as I remove the charing lead it shows the correct battery percentage. I've tried resetting and reinstalling Windows (but not yet tried to recover from the cloud). I've installed all the available updates. Any suggestions? I'm still within the return period but since it looks like a Windows bug a replacement device may be the same.