I have a samsung galaxy young s6312, stock android 4.1.2 jellybean, rooted. Since a few days I have been facing an issue with my battery. When i charge my phone, then remove it from charging, suppose at 78%, then the phone stays at 78% for about 1 hr or so, even if I use it extensively, and then the battery level begins to descend sharply, within the next half hour, it will be at 50%. this issue came up recently, is it a problem with my battery or is it a software issue??