Mine was flickering right out of the box since auto brightness comes configured to be on (Power Saver options may come configured on too). I was in a room with a bare incandescent overhead light bulb and an off white wall directly behind me.
I NEVER use power saver and I immediately turned off Auto brightness and went to full brightness, as always part of my initial set up, and I haven't really seen any significant flickering since. Though I haven't had alot of time actually using the device.
I think auto brightness was being over active and trying to over correct the screen brightness based on the lighting level of the white wall behind me.