Mine is having the same problem and according to my wifi provider (Kingston communication) something on these phones is causing an upload of nearly 1 meg which stops you from been able to use the internet because there is no room for download so while I'm connected to my wifi with my s8 nobody else can use the internet either ??
In having the same wifi issues, it's not the router at all. My wife is having the same issue as well and we both have refurbished galaxy s8 phones My roommate has an iPhone 7 and doesn't have the issue.There is no ip conflict at all. Signal is perfect but all the time we get limited or no connectivity or connection not available We notice it most with Facebook messenger.
I have tried all but returning our phones for replacement. Never had this issue on my s7 I had.
Logged in just because of this issue.
My Galaxy Note 8 had an update yesterday, since then the Wifi has been unusable. The ! icon next to it every couple of minutes, areas of good signal dropping to zero or 1 bar. Sometimes speedtest would be ok but internet browsing is impossible.
This is happening at work and home, so it's not a router issue. My wife's Huawei is ok.
I've tried the Wifi dump resets as posted here, tried resetting my network settings etc, no change.
The only thing that seems to have had a positive impact, weirdly, is doing a Force Stop on the Samsung Cloud service but I'm sure it will come back.
I can't believe something as fundamental as Wifi is this messed up.
You spoke from my tongue buddy I'm having same exact issue which is so frustrating .. Did you figure out the fix ?
Same issue... Tested all the static Ip, WiFi channel, factory reset and all other bull solutions recommended here and in other forums. None of those solved the problem. Get this togheter SAMSUNG.