Could be any number of things causing this.
Is it only on one wifi connection, or all?
Do you know if connecting to 2.4 or 5ghz?
Check the ip address being used by the phone and other devices connected to same wifi in case of conflicts.....
Try forgetting the connection on your phone and reboot the router to clear the DNS cache, before reconnecting.
Finally, it could be a faulty device, so if nothing fixes it, take it back for an exchange.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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