I had this issue and another user helped and it works. I reported it to Samsung as well. see if it helps Getting problems with the Note 20 and Note 20 Ultra wifi disconnecting or pausing while still connected? Go to Settings -> Location -> Google Location Accuracy Turn it off. Wifi will remain stable and connected! It does mean you won't get the advanced location parts of the phone working for example the camera will ask you to turn it back on. Google Maps might take slightly longer to lock onto you. But at least the phone stays connected to wifi. This is clearly an issue with the location side of things as it uses wifi, bluetooth, gps and mobile data together to lock your location. So Samsung, you have a software bug that needs squashing and squash it fast because you haven't solved this issue and the phone been out for months. If it's a hardware issue then you got bigger problems! Thanks to everyone on here who all managed to figure it out and spread the message. Please submit reports (and to exisiting ones) to Samsung under the Members app and add that turning off Google Location Accuracy stops the issue of the Wifi freezing/disconnecting. The more of us that submit it, the quicker Samsung will realise it's not a one-off. I'm disappointed that Samsung can't seem to find the issue themselves.
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