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I am sorry to hear that you are having this issue.
Try these steps please, go to Network options in the Main Menu.
Then choose reset network settings.
For older models, follow the steps below:
Step 1: While the TV is On, press and hold the EXITbutton on the Samsung remote control for 12 seconds. The standby light should blink the entire time without interruption.
Step 2: The Factory Reset screen displays a warning message. Select OK to proceed in resetting the TV.
Step 3: After the TV completes the Factory Reset, the TV will automatically turn Off.
Step 4: Upon turning the TV On for the first time after the Factory Reset, the Plug & Play screen will appear just like when the TV was initially set up.
Then connect to the network again, press the "Menu" button on the remote. Select the "Network" option, go to "Network Type," and set it to "Wireless." On the same menu, select the "Network Setup" option, which leads to another menu that offers the ability to choose the network name. After finding the correct wireless connection, the TV requires the Wi-Fi password. On entering the right password, the system prompts the user to press the blue button. Finally, the TV attempts to connect to the network. After it makes a successful connection, the user must press "OK." Some TVs may need to be turned off and on again in order for the connection to work properly
Let me know if this does not work and we can try another solution.
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