There is an interesting post from the NOW TV Team on this thread mentioning that the bug should be fixed with the 8.0.3 firmware on a NOW TV box/stick (doesn't mention any other devices)
Might be worth anyone suffering this issue on a box checking - from the box/stick homescreen go to Settings > System > About and check the software version is 8.0.3 if not go to Settings>System>System Update to see if an update is waiting.
If you are already on 8.0.3 you could try a forced software update to see if that makes a difference.
To do this press Home on the remote to take you to the home screen. Then do the following sequence on your remote quickly and smoothly
Home (x5) FF (x3) REW (x2)
If done correctly a Secret Screen will appear (if it doesn't, press Home to go back to the start and then try again). Choose Update software and allow it to run (even if it reports the same version as you already have).
If anyone is still on 8.0.3 and getting the issue I would post a reply to that thread and tag @Paul-C so that he is aware of the problem.
still happening, actually getting worse as now it freazes during playing, somethimes now info tiles are displayed at all, sometimes, juts "error" is thrown up on screens, where are the now tv reps to actually tell people what is going on, if this was a sky dish i'd be phoning up to demand a refund for "outage"