Default problem with notifications sounds note 3

I have this problem. Suddenly my note 3 doesn't make notifications sounds!!! No email sound, not SMS sound, not hangouts and Facebook sounds. But all the notifications icons appear in the notification bar. If I make a device restart....everything is OK but after some hours the problem is here again.
Yes I have already made two hard resets but no solution!!!
And yes the problem was started after the upgrade to 4.4.2 kit kat.
I am not rooted and the phone is original.

Please any idea?????