Hi, thank you for reaching out. Please try these steps again in the order listed on your Samsung Smart TV:
Close HBO NOW
Uninstall the HBO NOW app
Ensure that your TV has the latest software
Turn off and unplug your TV for 60 seconds
After rebooting, please reinstall HBO NOW
If you are still experiencing difficulty after completing these steps, please PM us with your HBO NOW email address, Samsung TV model, and the results of an Internet speed test which can be done at speedtest.net or fast.com. Thank you. ^SL