I am sorry to hear that paid YouTube content isn't playing very well. I have carried out some checks here remotely with the boxes and all is looking ok from here. Can you let me know which box you are using for this and if it happens when using more than 1 box?
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'just another nail in the coffin for Virgin Media'
won't work with sky either. my understanding from a mod on sky is that neither virgin or sky are allowed in the agreement they have with you tube. you tube want you to go directly to them not through an app on virgin boxes/sky q.