It's good to find your post as I have the same issue. I bought the UE55NU7500 last week. Great TV but every time I turn it on a window comes up asking to confirm the Freeview region. It shows the correct region in the boxes (i.e. the one I selected previously) but I still have to confirm it.
This is not a random thing as it happens 100% of the time. I checked the firmware and I have the latest version. Is this a bug? Luckily I have a John Lewis guarantee so I'll send the TV back if it's a known bug that hasn't been fixed.
Update: I've just found this thread which has a solution:
The solution is as follows:
3. Auto Tuning Settings
4. Standby Auto Tuning - turn this OFF
I've now done this so I'll confirm it's fixed the issue permanently in a day or so.