Wifi connectivity

do these steps one by one and lets see

 1. Forget all WIFI devices which were connected earlier.
Again turn on WIFI> Scan> and try to connect.

2. Or click on "add network "and try to add manually.
If after all settings if won't work then

 3. Reset network settings >Settings>General Management>Reset >Reset network settings)

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve Wi-Fi issue kindly follow below given step:-

- Forget the Network:-
Go to apps screen > 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.

If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question), along with the screenshot and videos.
Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.

Thank you for contacting Samsung.

Warm Regards,
Samsung Customer Support

even i am facing this problem, sent 3 error reports also

I too have the same issue. if we restart the phone it gets connected first time but if we disconnect it again and reconnect then the issue occurs again. Even i sent 2 error reports but still no update from Samsung.