Hello Bobmcfish,
Thanks for taking the time to post and I'm sorry to learn you're having problems with your V6 box.
I have been looking for any known issues and there is one regarding blanking screens but this should only be happening if your video output is set to 1080i.
If your video output is to to 1080i then please disable this and select another option.
You can do this by going to -
Home - Help & Settings - Settings - Video Output - Video Output Format.
If it's already set to a different format then we may need to arrange for an engineer so please get back to me when you can.