Sky streaming faults

[AP59]

On various channels the sound goes off, then the picture freezes, then the screen goes grey. I have to wait a minute or 2 then everything comes back on 

It is not the broadband as have 2 packs and the other one works fine

[lettice]

The symptoms are normally due to a poor wifi connection in a certain location within your house.

Firstly, best to make sure it's not the connection to that puck, compared to others;

Do a network speed test on each of your Pucks.
Launch Netflix on your pucks (you do not need to be logged into it, if you do not use netflix) and scroll down the left menu to Get help.
Choose Check Network.
Would suggest running the test a few times, say a few minutes between tests.
What is the speed on your working pucks as well as the intermittent faulty puck.

You could try swapping over one of the working pucks with the one that's not so reliable and see if it still causes issues in that location.