There is a real problem here that is unique to the new Note 20 Ultra. (And probably the standard models too). The problem seems to be related to WiFi 6 (5GHz Band). - The workarounds posted here have no impact. The behaviour is easyly observed when doing an ookla Speedtest. In my case I have 4 AP's around the house and the problem is only shown when I connect to the WiFi 6 enabled TP-Link Archer AX1600 AP. (I have a 115/35 Internet connection). When a speedtest is started initally the downstream speed is around 110Mb/s, and then it rapidly declines to about 80Mb/s, The upstream starts at 35Mb/s and then rapidly declies to about 1Mb/s. This looks like the the Phone is thottling back the speed or transmit power to a point where the speed rapidly declines. I have a Galaxy S20 Ultra and it does not exhibit this issue on WiFi 6. The Note 20 has no issues on a 2.4GHz band or an 802.11ac Standard 5GHz channel. The problem is only on 801.11.ax channels. I am a network engineer and have tested this extesivly, with the Galaxy S20 and Note S20 on the same AP's and in the same location. Hopefully Samsung can fix this soon.
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