Default [Q] Samsung Galaxy S5 WiFi problem

Hi there,

My Galaxy S5 stops receiving data from my office WiFi network though still connected. My SGS3 was working fine and all other phones here at work have no problem with the WiFi. We are working with WPA2. Just to clear things up a bit; as soon as I get to work, it's working fine and after a while it stops receiving data. I cannot navigate anywhere. The WiFi is still connected and disconnecting and reconnecting from the network does not solve the issue. A soft reboot solves the problem partially (the problem persists after a while). I have also checked with our sysadmins only to confirm that they do not block anything on the WiFi; this only happens on local LAN.

Tnx everyone in advance