Can anyone please HELP!

I am running OS 2006 (Scirocco, not Gregale) and Maemo Mapper v1.35 on my n770. I have a Holux 240 GPS. Everything has been working splendidly until today when I was riding down I-95 in Florida following a route I had downloaded using my bluetooth cellphone. MaemoMapper suddenly shut itself down. When I tried to re-open it, it would start to load, then the "loading" dialog box disappeared without loading MM. When I tried to load it again, it loaded, then shut down suddenly again while trying to download the route again. This occured two or three times. Ultimately, I was unable to ever get MM to load again. What is worse, other apps fail to load now too. The n770 locks up and then either reboots itself or I have to put the cover on it to get it to shut down as the hard button won't cause it to shut down. Application manager won't load, and causes a reboot. Also, File Manager and Web browsing won't load and cause a reboot. I am really unhappy as my tablet is now pretty much useless! What to do??

thanks,
Neil