Unfortunately, Contact Manager Stopped Working on Lenovo S650 Andriod 4.4.2?

I did following but still problem exists;
I moved all contacts to Phone Memory
I deleted cache of Contact Manager
I deleted app data of Contact Manager
Did Factory Reset
I deleted all contacts from SIM/Gmail/Phone etc. And then exported to Phone Memory (Total Contacts: ~500)

Still no luck! It is really really annoying, contact manager often stopped working (~10 times a day) and it takes 15 minutes to start working to normal.

Zohaib Jahan

Restart your device and perform a hard reset, it might solve your problem and do get LEO Privacy Guard v 3.0., it will grant you many advanced security features that can be very useful for you.

Freeman

Thanks for the comment, I restart my device daily. I already performed 2 factory reset but after 3-7 days this issue comes up again. I'm using "Security" app, but I Leo Privacy Guard upon your recommendation.

Zohaib Jahan