I've changed the DNS server on the router for the PPoE settings to the google DNS you mentioned. MTU is set at 1480. IPv6 is disabled, should I enable it and also set the same DNS for IPv6?

@ARGamingPK1 I have tried just having the Deco in router mode and experience the same issues.

@David-TP Disabling Mesh Technology did not resolve the problem.

@David-TP Thanks for the reply, I have received your email. I've disabled Mesh Technology on the Pixel 9. Will report back if I notice any changes. Fast Roaming, Beamforming and Smart DHCP already...

That isn't an option because they're in AP mode.

@ARGamingPK1 There's nothing on my Deco App, but this is the info from my EX220. Is that what you're after? I don't understand your question - using DNS in DHCP server?