My phone is going crazy! NEED HELP FAST

Sometimes when I try to take my phone out of hibernate mode, the screen will show a flash if light (most of the time white or white and black striped, but sometimes blue gray or purple) usually lasting from 1-2 seconds, then it turns itself off. When I try to turn it on (both power and home buttons together and just power button) I am left staring at a blank screen for about 10 minutes. When O finally get it to the apple screen, I wait for about 30 seconds then it gives the flash of light again and I have to turn it on again. Sometimes I get lucky and I don't have to wait ten minutes to get it to the apple screen, but most of the time I have to turn it on about 5-15 times. I have wasted too many hours and wasted up to 60% of my battery just trying to get my phone on. Please help me.