5c crashed overnight, not being charged or used
Woke up this AM to 5c, sitting on coffee table, not being charged, not used for hours, nearly full battery load when I went to bed last night. Phone would not turn on...totally black screen. I went on-line looking for support & tried pressing on/off button & home button for 10 seconds & it worked to get it up. However, battery was dead & it would not take a charge. Magically, I fiddled around with it & it did start charging. So...problem solved for now but why did it crash? Is this an on-going thing?
iPhone 5c, iOS 8.4.1