Force closing of apps automatically and data connection problem

On my Gionee s5.5 phone, when i turned on my data connection and than i open any app many applications that I open closes right away, returning me to home screen. Every time I open the application, it force closes. Now, just recently, the browser is beginning to close, but not immediately like the apps. I have uninstalled and re-installed apps, done virus scans, and even factory reset. Nothing has helped.

(I didn't rooted this phone) Now what should i do???