I have a S6. It had worked great. I was down to 63% so I plugged it in and charged it for 45minutes. I took phone to work and got it out to use and it was really hot. I could not do anything with the phone...the blue light was on and the Samsung name was fading in and out. I tried holding the power button to turn it off and NOTHING happened. After 3 hours, the battery died. What is going on with the phone?