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I haven't experienced it myself, but it's well known that all electronics are VERY sensitive to heat (why computers have fans). Since you know what's causing it, you might want to consider some way to keep the Navman cool, like a chemical-ice pack that neither leaks water and can be thrown into the freezer again and again. THAT would keep it cool enough, although kinda bulky, to continue to operate. Besides some kind of external cooling, I know of absolutely nothing that could solve that problem.
Go to the manufacturers website and register the GPS and download any communicator software that is needed then hook it up to a PC and see what updated material is available. The Map software will cost about $75- $100.00 if available.
Apparently, according to the Navman helpdesk you have to open NavDesk and from the menu, go to Tools and then Recover Keys .
I tried this on my S80 and I got an error, (E000050) which I was then told I had to send the unit back for repairs. This is my worst purchase ever. I'm on my third unit and have had nothing but trouble.