Originally Posted by MarkC1984

This is a power saving feature. Cannot remember of the top of my head the menus you need to enter, give me a couple of minutes to check and I will come back to you.

---------- Post added at 21:58 ---------- Previous post was at 21:56 ----------

Press home, help and settings, settings, devices. Top option should be Power Saving options, have a fiddle in there and find what works best for you, I personally have them set to off.