I had same prob this is the answer I found on Samsung community page :
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Since posting the query, I have been playing around with the TV. I did something and think the Region Selection is now gone. The morning after the change, frustratingly, it still appeared. However, I have not seen it since, which was 5 days ago. Please try this, and let me know if it works for you. FYI, I have a 7 Series.
1. Settings
2. Broadcasting
3. Auto Tuning Settings
4. Standby Auto Tuning - tUrn off ! (Deselect) you need to be tv mode not smart tv mode