Screen flickering when using Sky

[Platty2]

We performed the latest software update last night and since then the screen  is flickering and sound is intermittent making it unwatchable. It is not like this on the main TV so seems to be the Sky box. 

[Chodley]

What version was it on before and afterwards?

Sounds like an issue with the cable or socket perhaps. Can you try a different cable in a different socket?

The firmware update is very unlikely to  cause this.