I got note10 plus and I have constan issue with wifi speed. I tried almoust everything what you can find on web regarding this issue, but nothing seems to be working.
* reboot router
* reboot phone (both ways)
*disconected and forgot wifi networks
*clear network configuration
*dealt with bad system cash
*phone is up to date (N975FXXU4CTE9)
*checked all app
*restarted phone in safe mode
*reset phone to factory settings
All it does, it goes up to speed for first 1 or 2 test and between (180 - 280mb/s) and then back to 20 - 30. I got virginn media 360mb home broadband.
Samsung don't try to blame virgin media or rooter as you did in another post regarding wifi issues but better find solution.