Thanks! i from Argentina and i dont speak english very well. Yes. I having the same issue. I hate "clean master". I thinks only work for make troubles. My notification sound work well until today... i reinstall, clear cache and all the solutions read here..but only vibrate. No sound prompt. Thanks to much to all people here for helping!
				
			 
	 
 
		 
 
		 You're right, it's gone again.  But it does come back as soon as I re-enable TalkBack and then turn Switch Access on in the Settings>Accessibility menu.
  You're right, it's gone again.  But it does come back as soon as I re-enable TalkBack and then turn Switch Access on in the Settings>Accessibility menu. 
 
		 
 
		 
	 
 
		 
 
		 
 
		 
 
		 
 
		
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