Yesterday I went and updated the galaxy tab 3 to Kit Kat from the previous update. I let it update uninterrupted until it was finished, the update was finished with success and all is well; apps work, wifi works ect. But I cannot for the life of me figure out why the lock and unlock screen sound does not play a sound? The lock and unlock sound was good before the update to Kit Kat; although it is not a big deal just wondering if others have this problem?