I've had the same problem on my Flip3 as well as my wife's. It started immediately after updating to Android 12/OneUI 4. It's intermittent, some days worse than others. Turning Wifi one and off solves it, but that's obviously a lousy solution. I've tried all the usual fixes - clearing cache partition, resetting network settings, etc. My connection was perfect before the update.
Same issue with my ZFlip3 since today. Something must have downloaded in the background. Suddenly my cover screen clock settings changed and I had to change those settings back. Wifi is not working most of the time now. I've reset network settings but this didn't help.
I have the same issue on flip 3. My note20 ultra works fine but not on flip3 and its annoying me to no end!! Initially i tot its my internet connection or router issue but cant be as our famiky's other wifi gadgets are working fine . Hope there is a solution soon.
Yes, tried all of this but what worked for me was to go my actual router page and toggle the authentication key type..ie WEP/WPA2/Auto etc... Doing this and my wifi has been rock solid for 24hrs. Which key type worked for me may not work for you so mileage may very but this has been the only solution that has worked for me.