Mute button doesn't work on a rooted Samsung Galaxy S4 Device: GT-I9500
Android: 4.2.2, rooted

Whether I press and hold the power button and select mute from the menu or double-press the sound icon in the pull down notification menu, the phone still rings when I receive a call or a notification.

I using the volume button to turn the sound off, but now it's on vibration.
I have managed to solve my problem taking the following steps:


Install the Clean Master (Cleaner) app:


  Clean Master is a Free, top-rated all-in-one cleaner app for Android™ devices.
  Clean - Cache files and residual files
  Clear - Search/call/text/etc history
  App Management - Move app data to the SD card and uninstall/backup apps
  Kills tasks - Smart memory booster  

Clear the system cache;
Restart the phone.