I have got a dual sim version. The data is always intermittent when I switch on dual sim with 1 card on mobile data and another card for calls and messaging. Data is always intermittent when dual sim is on and is normal when 1 of the sim card is switch off. I have not receive any updates to fix the data problems in malaysia yet.
samsung galaxy s6 edge plus (g-928g) (Indian unit) is also having hell lot of problem with 4g (volte) network since november security patch.. samsung released dec sec patch on 29th dec and yet the 4g issue is still there.
I own the international version of the Note8 (with the Exynos 8895 processor) and I received the update yesterday as well.