I have a new (used) TT 2nd edition GPS. It seems to work well so far. However, it appears to have a "screensaver" type feature that I can not deactivate. I have routes set up and they will begin with no problems. However, after just a few minutes the route will go away and various screen shots of TT features will appear. They will only defer back to the map when the screen is touched. Of course, it always happens right when a turn is necessary. This is not the tips feature. I have deactivated it. I also have problems with the unit maintaining the settings I have set - for instance, automatically changing to night mode when dark. Any ideas on what is wrong?