I've had BT 500Mbps installed on 6/01 and my WiFi speeds sat next to the router can vary between 30 and 500 Mbps on the same device.
Sometimes switching the WiFi on the phone on and off can vary the speed as well.
Is there a setting I need to change to get consistent speeds or is this par for the course.
My old broadband gave consistent speeds so at the lower end the BT speed is worse.
are you connecting to 2.4 or 5ghz wifi?
have you read this post
I had a look at that post. The difference is that I am getting the variation between speeds on the same pixel 6. 500Mbps one minute and 30 later. Its connected to the 5 GHz network.
I have a power line extender with a wired and wireless connection in another room but it's the same problem there.
Are you certain that you're always connecting to 5GHz, given that both bands share the same SSID?
Download a WiFi analyser & check for competing networks. You can then manually select the WiFi channels in the SH2 for the least congestion. Even if the 5GHz is clear it's worth moving away from the default channel 36.