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In some instances, switching off the TV by using the remote for an extended period of time can cause a change in the network settings.
By default, the Samsung Smart TV regains its DNS servers settings on its own.
if your MAC address of Samsung TV has been blocked for any reason, it's not able to recognize any wireless network further.
It may be a reason that you have not downloaded or installed the most recent firmware updates.
Due to storms or heavy rainfall, the LAN cables get disconnected from your ISP. This may be a big reason for no internet connection issue.
If you have an issue with the WiFi router or modem, your television won't be able to locate or connect to a WiFi connection.