When the RNS-E screen is on night mode and zoomed in to the highest level (54yds) the brown graphic which signifys a urban area seems to very very slightly flicker in lines, its like white noise you get on a tv when it gets interference. You have to look at it real close as its not noticable from the driving seat but its really annoying me now I know its there! Its not a pixel issue as they are all working and it only does this on the map screen and no others. The lines are not white they stay the brown colour but the flickering can be seen if looking at the screen for a while in the same place. Anyone know what this might be?