While trying to select a program to watch on My 5 (The Robson Green walkies prog) using My 5 on the Aura the tv screen went blank. No sound no vision, no visible response other than powering off the Auro. Wait a few minuites and the Aura can be turned on with the remote. Normal service is resumed. Tried it twice more, now as soon as My 5 app is selected the screen goes blank.
I’ll investigate further today and check iplayer etc, but first I need to repair my central heating. 
I’m guessing that the My 5 app needs an update???