I am totally confused about my charge's battery usage. Sometimes it gets "hot" while nothing is actively running... For example: 1. leave home with 100% charged 2. used google navigation for ~30min to find a place - after usage maybe 80% left or so. 3. hang out with people for 2-3 hours with minimal phone usage. 4. pull out phone - it is WARM and battery like 30-40ish. I read the battery usage and it has mostly "display and brightness" and "system OS" for most usage. Its not like i am turning my phone on and off all the time and i seriously doubt i "accidentally" turned it on and off in my pocket... So i am super confused about this... any recommendations?