This also sometimes happens to me.. I don't know what causing the problem.. Im using private dns to block ads in apps.. Maybe this settings also causing issues..
Whenever i got issue I'll turn off the Wi-Fi and use with mobile network.. Sometimes it will fixed automatically.
We acknowledge your query and apologize for the inconvenience caused to you and will surely assist you regarding the same and please follow the easy troubleshooting steps which might help to solve the issue.
Restart the Router and Mobile Device. Switch off your Router (at the wall or with the power button on the router) and wait for 2-3 minutes before switching it on. While you're waiting, press the Power button on your mobile device and select Restart.
Once the router has been successfully connected to the internet again, try to connect to your network on your mobile device.
Make sure there is no interference between the router and your mobile device. Concrete walls, fridges, and microwaves can all interrupt the Wi-Fi signal.
Disable flight mode. Find the Airplane/Flight mode option and turn it off.
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
