This had happened before and the fix is always disabling band steering.
Last time i tried troublehsooting it i remenber that it connected but then it had some authentication error suddenly, and then i disable band steering and the problems was gone.
As far i have read on the forum this is a known issue of Sasung Galaxy and Band Steering.
Like i said on the tread yesterday i did a implementation of 25 APs 225s, the client told me that they got a few S4, so i will see how it goes with it and yes those that got the S4s, and S3s are TOP users in the company, i mean Directors, Managers, VPs
I do have enable ClientMatch. Let see what happens!
Cheers
Carlos