Over the past few days I noticed I would charge my phone all night long and would wake up and it be fully charged. But I would unplug it for about 2 hours and it would be all the way at 25% or even lower? It has never done this before and I have not done anything different with it. Also it will get extremely hot at night and random times when I am not even using it. I have turned it off and on multiple times. Also I have let it die completely and let it charge back. Last time it started acting like this just a little bit there was an update the next day. Does anyone know what is going on? My carrier is Sprint.