I’m having the exact same issue. Although my issue seems to be with certain YouTuber’s or pages. It’s lacking, the words are slower than audio, and if left on - the TiVo box will crash and I won’t be able to use it for some time. Still can’t get any answers to this, and I have tried all help & support offered, online.
It is an issue we're aware of and I'm sorry you're experiencing it. We have flagged it further to the relevant team. I can see our team are working on a resolution and we hope to resolve this as soon as we possibly can.