Whilst everyone is welcome here and Moderators/users can give advice , specialised support is focused on Europe and this is UK/ireland Board.
For reference Canadian site here : https://r1.community.samsung.com/t5/Canada/ct-p/ca
For me, when the TV was using 1270, the TV wireless was not able to connect to a Ubiquity AC-Pro AP & a USG device over only 5GHz. I had to downgrade Ubiquity WiFi 5Ghz setting to a lower performance before it was could lease an IP address.
After the 1280 update, I was able to connect again using the higher performance setting which I think Samsung had tweak the TV wireless drivers.