From your post it would apear that it is your wireless connection is the problem not the internet connection. Have turned off smart setup and also split the 2.4/5ghz networks to see if that helps
there I see no guarantee on your wireless connection so if you are still in your fixed term contract then you can cancel whenever you want but there will be early termination charges to pay. Just stopping the DD will result ultimately in being referred to debt collection agency and your credit reference dropping
Welcome to the Community and thanks for your posts!
Sorry for the problems you're having with your broadband and BT TV service. I can appreciate that it is frustrating that the service keeps buffering. As you have tried what the guys on here have suggested please send us over your details so that we take a second look for you.
Click on my username here >> RobbieMac << and you'll see our contact link underneath my profile picture.