If for some reason there's been a hard reset, you'd need to manually reset the hour (and only the hour) once you got a satellite lock. While units like this could figure out your time zone, only the most recent TomTom units (with their own issues) actually attempt to do so. I wonder whether your battery is getting a bit long in the tooth. Out of curiosity, how long will your unit remain running if not connected to power?
As for your problem of your unit coming on with a "Navigate to", I can picture a couple of reasons. The most likely is some crud between the glass and bezel in the upper left corner. Work a business card carefully all around the periphery of the glass and see if you can remove anything there that might be causing phantom presses, especially in the upper left.