Why does my iphone 4s keep blinking?

Since i updated my iphone 4s to the latest IOS update, my phone has been randomly taking screenshots, and when i'm doing something, it turns off and when i click the home screen and it takes random screenshots and when i swipe to go back to what i'm doing, it keeps turning off and I'm getting frustrated. I've already did the DFU mode, and i already restarted it, i even had to accept the fact that i'm going to lose my recent things because i haven't backed it up in a month. I'm very annoyed and the fact that it keeps blinking at the lock screen, and I'm going on vacation tomorrow after school and if my phone keeps doing this, i'm not able to call my mom while i'm there. What can I do?

If the problem persists and it's a brand new phone, go to Apple. Or do a factory restore.
You may want to keep a copy of your pictures or contacts

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