Note 20 ultra WiFi extremely unstable after latest update.

[WireWrangler]

I recently received a very welcomed update to my Nordic version Note 20 Ultra. Baseband version N986BXXU1ATJ5. I was happy to get it because it fixed an issue that made Google pay not work. Everything was fine until I started to notice that I would constantly loose internet connection. I first noticed it at work and thought they were having problems again, but then I noticed it happening at home too. I went through all the trouble shooting of restarting my router and modem and clearing cache on my phone, but it's no good. I randomly loose internet connection and to get it back i have to turn WiFi off and on again. It is extremely unstable and annoying, especially when trying to message or video chat. It's also annoying because now I get cluster notifications. If I'm not using my phone for a little bit, all of the sudden I'll get several notifications in a row from various apps that have been offline due to the problem. 

Is there anyone else experiencing this? Is so anyone have a potential fix?

[Grumpywino]

Same here! I have had a nightmare since the November security update - I use a Google wifi router and have to switch between the main network and guest - it seems to hate 5ghz now (guest seems to default to 2.4). For some reason Samsung don't allow us to set a preference. I have tried all the usual trouble shooting steps but to no avail. 

A key issue for me is a poor phone signal so I rely on wifi calling...hopefully in an emergency I'll have time to switch wifi networks!!

I have submitted feedback in members app and am expecting the usual template response. I just hope the next update fixes the issues, god knows what they did with November!

[WireWrangler]

I also submitted an error report in the members app. Hopefully they can get a quick fix on it. Interesting that you say it works well on 2.4ghz. I'll have to see if that works for me too. I also have a Google WiFi system set up. I'm kind of wondering if it is having a problem with jumping between nodes. 🤔

[Grumpywino]

It no longer works well on 2.4ghz! It is absolutely fine in safe mode - at least I haven't so far had an issue in safe mode. I dug out my Note 9 which hasn't been updated since August, no issues at all with that, and all other devices are fine. I am debating a factory reset.....I really really do not want to do this, especially as some searching around for other Samsung users with wifi issues reveals this to be a temporary fix at best, and yet safe mode would indicate an app issue? I can't seem to find out what is different about wifi in safe mode.....

[Grumpywino]

I'll add that back when I had my S8 Plus and used my ISP provided router (Virgin Hub 3) I had this issue. Then it happened with my iMac so I bought the google wifi back then and it has been superb since, no problems with the S8 plus, nor the Note 9 that followed it.

[WireWrangler]

That is very peculiar it would be fixed when in safe mode. I would assume that WiFi is solely a system app, but that would suggest that it is a non system app causing the issue if that is the case. Perhaps Samsung has an additional/supplemental app that does something with WiFi. I was thinking maybe Secure WiFi but I haven't set that up on my device since I have something similar with my ISP.

[Grumpywino]

A factory reset didn't help, I kept it barebones but to no avail!

[WireWrangler]

It's definitely a firmware issue. I'm afraid we are going to have to wait for an update for a fix.

[Grumpywino]

I'm afraid it will have to happen quickly, and I don't hold out much hope having googled the problem extensively, as without reliable wifi calling this phone is no use to me.

[Grumpywino]

No doubt my tweaking is a temporary fix, but I have had some stability by changing things in the advanced section for the network, including setting a static ip and choosing that in ip settings, changing DNS 2 to googles, and choosing use device mac. In Developer options I have wifi scan throttling and wifi safe mode selected (although they didn't previously seem to make much difference). How long this will last I don't know.