I've seen this happen. To fix this I change the router WiFi security to WPA2 AES personal security.
There are also other issues which we have collected at the next link.
hi could any one help i bought a smart tv 55inch 8000
connected to the internet but when i try to connect it always
says on scree connecting but it never does when i check
setting the network says connected so all the wireless
details seem correct i have a aol router 512 if this is any
help even if you let me know how to contact samsung