My iphone 6s was on 100% when i went to school, and i wasn't on it AT ALL this morning and i tried turning it on in second period and nothing And then a really dark blue screen came up then went to black, I turned the ringer off and on and i felt the vibration and then when I got home It wouldnt wake up I put it on the charger not even the battery icon came up.... Im so confused i did absolutely nothing