I get this too occasionally....but in The Walking Dead it seems to be much worse. Whole chunks of dialogue cut in and out so making me really frustrated from missing a lot of information.
I've tried rewinding, fast-forwarding, rebooting the box and also unplugging for a while. None of it works. May have to try the hard Reset option which will be a PITA.
Yes, the worst frustration of missing dialogue was during The Walking Dead in series 8 throughout most of (possibly) Ep 7 as mentioned by someone else.
I've moved on past it now and can't remember exactly, but I missed a lot of plot from whichever episode it was. However, I am carrying on hoping that Series 9 won't do the same at an important point.
Maybe I should keep a note of any future missing sound/dialogue events to report it here?
I've also had this issue, spent 1h20 on the live chat with two different people and was told I'd be transferred to higher up.
My issue is mainly on my now tv stick, I was told to reset everything and download updates.
I think it's a content issue that Now TV really need to sort. I think a lot of people are hacked off with it