You can see here how much reputation rocbianco has received from other members.
7 April 2011, 04:29
That's perfect - thank you!
Tap on Change preferences in the menu then on Brightness preferences. On the first screen (day and night colour preferences) tap on Done and you will see a screen called Battery saving preferences - tap on Never turn off screen.
That should fix it
You will get a second Battery saving preferences screen - Switch off when external power is lost - that probably isn't affecting this but you can untick it if you want to be sure.