My WiFi has been terrible in the last three weeks

[Connord812]

Me and my partner changed internet provider earlier this year to EE and so far they have been great, but three weeks ago it really really slow we can barely watch a movie on netflix, we live alone so we not using any more then usual. Is this to do with the summer holiday?

[XRaySpeX]

Which EE BB plan are you on? What EE router do you have?

[bristolian]

Are wired connections equally affected?

It could be an in-home wireless issue if so.

[wessex-mario]

Have you done a network scan to check what other wireless networks are in your area?
If there are many neighbours all trying to use the limited channels then this could be the cause, especially if they've also  started streaming or gaming. Modern routers will automatically channel hop to use a free channel if one is available, but if your locality is congested, wireless can slow down dramatically.

If you can route a cable, it would be far better if you had a wired ethernet connection between your router and TV rather than wireless. Wired is both faster and interference free.