Thanks for the replies, Had a response from my provider and he said he had not seen that .
Had the same last night always on Atlantic and always Now Tv screen saver. Did notice that as well as the bouncing Now Tv the name Roku travels back and forth left to right at the bottom of the screen.
Not sure I am going to get very far with the provider if he insists its not being seen by anyone else.
Unless anyone else is experiencing exactly the same , if so perhaps they could without naming the supplier add to the thread.
Or pm me with the name . Cant see me being the only subscriber to have a screensaver showing regularly.