My name is Randy, I am sorry to hear that you are having this issue.
I will be glad to assist you with this.
My goal is to give you the best experience possible!
The best option will be to try power cycling the tv and your internet modem.
When you power cycle a device, you are simply switching it on and off, while waiting a few minutes in-between. Sometimes, this is all it takes to get a device back to proper working order.
If you power cycle your tv, and wireless router, you are eliminating these potential problems. Just by power cycling the router, you are allowing it to establish its connection to the TV without encountering the problem that prevented such a connection being made the first time.
Follow these steps please.
Disconnect the power cord from the TV. Then disconnect the power cord from the internet router /modem.
Then reconnect power to both, power on the tv and wait 5 minutes for them to completely power on and reboot. Then check.