I don't have any detail to work with here. We do know that hiding the SSID and more can break WiFi on some devices.
Your post has so little detail that I can't tell if it's something we know about. To help others we have the top posts over in the CNET Networking Forum and a post specific to Samsung devices.
Tell more and if you can't change the router settings, I need to know that so we can stop before we start.