Sometimes for days. Always call in the failure so they either tell you about the service issue or provide a fix. When their services stop, there is no fix until they bring them back.

To me this is a real issue with Smart TVs as there is no agreement in place that you can hold them accountable if they shut down the services.

Also, the Smart TV functions that should not depend on Samsung fail when Samsung pulls the plug. Why should the Smart TV need Samsung for web browsing or Netflix?