Hi,
Please try these troubleshooting steps to restore your Samsung TV Plus channels:
・Ensure you are running the latest Firmware. Go to Settings> Support> Software Update.
・Confirm your internet connection is stable and connected. Go to Settings> General> Network.
・Try changing the DNS setting in the TV to Google's DNS (8.8.8.8), then restart the unit. Go to Settings> General> Network> Network Status> IP Settings> Enter Manually.
If you continue to have issues, please contact us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. LiveChat with an agent, as well as manuals, software, and warranty info, can be found at the ‘Support’ link on our Samsung website.
~ Samsung Advisor
・