Google Pixel 9 and Orbi Wi-Fi 5 issues

I've had my Orbi setup for years with little to no problems. However, for the past 2 weeks, my Google Pixel 9 Pro phone has behaved like it's on a dial-up modem connection when on my home wifi. It's fine with five other Wifi networks I use regularly, and its good with just the regular T-Mobile data connection. But it's definitely not happy with the Orbi Wifi.

The last change to the Pixel was April 5th (system update) which was over a month ago, and it was fine for 2 weeks after. I've even done the Pixel 'reset network and Bluetooth settings' option to wipe the config from the phone and start fresh.

On the Orbi, I've twiddled some of the advanced Wifi settings in the  config but it's not changed anything. Has anyone else run into this? Any thoughts or suggestions? Other phones (iPhone, OnePlus) seem fine on the network.