One problem I have it set to disable mobile data when connected to a wifi. This use to work perfect on my S4 when I was was running 4.4.2. I'm now on 4.4.4 and it still mostly works except that when I'm no longer connected to a wifi it doesn't enable my mobile data again. I have to enable it by hand. If this I'd fixed it will be perfect again.
June 23 2014