My Tab S 10.5 will not charge past 90% no matter what. It used to charge as fast as my phone and all of a sudden the last 2 weeks it started this mess. I actually LOVE this tablet, it looks and preforms 10 x's better than an ipad. I love the resolution the tab s came out and really don't want to get another one. Any ideas? and IF I do have to open it and hard boot it, is there a certain safe tool I can use that wont damage the case/cover?