Dear All, there are one or more answers for this issue of screen blinking automatically.
1. In settings-Under wireless and networks-under wifi settings disable the network notification.
2. Download and install AIRPUSH from playstore. Run it and scan the mobile for the applications that cause problems because of the adds in it. Uninstall those application.
3. If you have installed any live wallpapers, do uninstall them.
Method 1 & 2 worked for most, n method 3 was the solution for few.. Try it..