Screen

Switching failure perhaps.
Take battery out and note if screen colour changes
Come back

i used to get this, its wierd, but this works - i used to use crappy batteries, like big packs for a pound or 2 pound, but the screen was doing this with them, but if you use somethin like duracell, the really good batteries, then this problem doesnt happen, at all, and the battery life lasts for ages aswell, so its worth the money to spend on decent batteries, i promise