Half way through each programme screen goes black

[CHERYL23B]

I have Sky stream it's been brilliant for over a year never had a problem then today every hour or so the screen will go black on the picture. I've all sound quality and I have to reset the box reset the telly and it works fine couple of hours later midway through a film screen goes black. I have had the telly checked and it's not the telly. I've swapped pucks over from other rooms and the same thing seems to be happening. I've reset the Wi-Fi. I have changed the HDMI port. I've changed the HDMI lead. Nothing seems to stop this from happening. Any suggestion 

[lainys]

Hi there @CHERYL23B , I’ve escalated your post to our Community Messaging team who will invite you to a private chat shortly and help you with this. 

Just look out for the colourful bubble to start the conversation. Please be aware conversations automatically close if there is no response within 48 hours.

Here's more information on how Community Messaging works - https://helpforum.sky.com/t5/Did-you-know/Escalating-a-post-to-a-Sky-expert/ba-p/3711147#M141