Q: why my iphone 6 turn off automatically

Hello sunny baloch,

Thanks for using Apple Support Communities.

From your post I understand that your iPhone is powering off while you're using it, and you have restored back to factory settings in attempt to resolve the issue.  For troubleshooting this issue I'd like you to please follow the directions in hte article below.

If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support

Have a great weekend,

Alex H.