FTTP Ethernet Speed Slow

[Jas00004]

We have recently moved into a house that has FTTP internet which has ethernet ports wired throughout the house.

We have a smart hub 2 and when we plug the ethernet into the correct port, our internet speed sky rockets but it doesn't maintain that speed.  It'll stay around 600MB for a minute then go back down to under 100.

Does anyone know why this is?

Thanks for your help!

[licquorice]

Have you tried connecting directly to the hub to rule out problems with your internal wiring?

Have you tried a direct PPPoE connection from a PC/Laptop to the ONT to rule out problems with the Hub?

[Jas00004]

I connected to the hub and the same thing happened, do you think the issue is internal wiring then?

[licquorice]

Not if you get the same problem when connected directly to the hub, you have eliminated your internal wiring.

Try a direct connection to the ONT, have a look here if you are unsure how to do that. Username is bthomehub@btbroadband.com and password BT.

[Jas00004]

Thanks, tried that and it failed with error 651.  Does that mean it is the hub?

[pippincp]

If you follow @licquorice 's instructions you do not connect to the hub, you connect the PC directly to the Openreach ONT (box on wall).