Kindly reset factory data with backup then try to it's again also go to wifi settings and click on intelligent wifi. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
As per your concern, we would request you to kindly perform the following steps to resolve your issue.
Kindly make sure that your cellphone is the only one having this problem on your Wi-Fi connection. If all devices are having Wi-Fi issues, then you want to contact your internet provider as the issue is not with your device but most likely with your Wi-Fi connection.
Path: Settings> Connections>Wi-Fi> Wi-Fi network> Tap and hold the Wi-Fi network that you're having trouble with until the menu allows you to select Forget Network.
Restart the Router and Mobile Device: 1. 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. 2. Once the router has been successfully connected to the internet again, try to connect to your network on your mobile device. 3. 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.
Reset the device Settings: Settings > General Management > Reset settings>Reset all settings to their default.
Update device software (If available): Settings > Software update > Download and install > Checking for software update > Software update available > Download > Downloading updates > Install now.
If the issue still occurs, kindly report the problems using a log file. To share a log file, click on the Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
