I noticed the wifi issues when using my new note 20 ultra (coming from an LG g7 thinq). I hoped changing the MAC address type from random to phone would have helped but it did not. I followed the below steps (pasted at the end of reply) and then went into settings -> device care -> memory -> and pressed clean now. I noticed YouTubemusic and Facebook running in the background even though I do not have accounts for either . I Uninstalled both Facebook and YouTubemusic app. Wifi has been working for the past 4 hours without any issues. "I would like to look into this issue for you. Let's look at a couple of things first. Does this issue happen when you're connected to other wifi networks? Have you made sure that your phone is up to date on its software? Have you tried clearing the cache partition on your phone? Turn off the device. Press and hold the Volume Up key and the Bixby / Power key. When the Android logo displays, release both keys. An 'Installing system update' message may show briefly before the Android Recovery menu options appear. Press the Volume down key several times to highlight Wipe cache partition. Press Bixby / Power key to select. Press the Volume down key to highlight Yes, then press the Bixby / Power key to select. When the process is complete, Reboot system now is highlighted. Press the Bixby / Power key to restart the device. "
... View more