One ui 6 problem with wifi speed

[Drsal]

Hii everyone, after upgrading to one ui 6 I notices severe lag when using wifi any where especially when watching youtube. Any fix please. 

[SamsungModerator1]

Drsal

Hello. I’m Mehad , Samsung Moderator
Thank you for asking the question
We wish you a happy day
Based on your inquiry regarding the update

Check if the phone has dropped or exposed to water
Try another Wi-Fi connection
Dial *#2663#
Tap Refresh Wi-Fi version
If you are still facing the same issue we recommend that you perform a factory data reset to resolve this issue using the steps below:-

Launch the Settings app and tap General management → Reset → Factory data reset →
RESET → DELETE ALL.

Ensure all user data is backed up using smart switch
from the link below and then use the backup tool to create a data backup
http://www.samsung.com/eg/support/smartswitch/
If you’re still facing the same issue, kindly take the device to the service center to check on it.
 you can follow the link below to find the nearest one :
http://www.samsung.com/eg/support/servicelocation/

If you have any other question, can you explain it to us
We are  at your service always