my Sony Z3 duel style cover stop working

[MajidOyed]

The cover work in the other user in may phone and stopped working on the main user after a month of us!

[Uliwooly]

@MajidOyed

Remove the cover > restart the phone > pair it again.

also do you have any antivirus or taskillers? 

[MajidOyed]

Try it nothing, and I don't have anti-virus or task killer, also I have two user account on the phone the main one is not working the other one is

[Uliwooly]

@MajidOyed

In other words the cover work fine with the main account but not with other accounts?

If that's so you might want to contact Sony directly 

http://support.sonymobile.com/global-en/contactUs/