Wifi won't turn on after using xender, Unless phone restarts
At last the problem got solved.

I had to backup all my data, do a hard reset.

I flashed with a new version of Cyanogenmod, and then with nano Gapps.
And a full reset after flashing it with Gapps.

After reboot, Reinstalled all apps from backup, and the problem was solved, wifi works well now.