My Micromax A57 Ninja 3.0 crashes while changing the wallpaper. It's getting automatically on and off for every 5 minutes. Also, the touch screen is not working and I can't open the screen lock even. I switched it off and I took away the battery many times without success. I tried every thing that I can do, but it's not working. I've lost my friends phone numbers and I'm unable to open Whatsapp. What can I do?