In the nicest way then, all that speed test has proven is that your iPhone can get those speeds in that location. The best way to check the connection speed on your V6 is to use the onboard speed check under Home > Help & Settings > Help > TV Care > (top of screen) > TV Speed test
Although having said all that, if other streaming services and OnDemand on your V6 are ok - is this only affecting particular programmes on Prime? Or all?
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks