Navman 530 slipping back and forth thru screens by itself

Hi

Got my Navman 530 last week and very impressed.

Anyway, I've noticed it sometimes has a mad 10 minutes and skips backwards and forwards through the screens on the menu's by itself. There are navigation buttons on screen in the bottom left and right and I assume it's picking up touch-screen input, but I'm not touching it.
I have cleaned the screen and it seems ok, then a few days later it'll start again.

Any idea's??

thanks in advance.

[getsurfers]

Do you have any screen protectors fitted?

Try running a business card between the screen and the body of the unit, as fluff could have collected in this gap.