Bad-no but occasional yes.
I also have a Roku box and experience the occasional buffering on that on the Now TV app so I don't think it's the box but I could be wrong
HI, I suffered from this a lot until the recent software update, since then I've had no buffering but I do get occasional picture breakups.
Yes I have been at times over the last 4 night with Now TV Box Sets/on demand. I have replied to a thread over on the Youview Community Forums about the issue.