You can add me to the list of bad Garmin Nav VI owners. My replacement acted up once. I don't touch the screen with my fingers anymore, I use a Q-tip or the filter end of an unlit cig and It hasn't acted up since. Call me nuts but I think the oil residue from your fingers builds up on the screen and makes it ghost. The plus of the Q-tip is no more fingerprints and smudges on the screen. The only thing I use to clean the screen is one of those eye glass cleaner cloths and no chemicals.