usually I can research and find my answers. My 1197 has worked without a hitch since 2011. In March I updated to 6.640, when I went out in April the GPS did not work and the interlink did not show on it or the 798 on the bow. I got another interlink appeared to try to sync fine then froze. The interlink works fine on the 798. I have lost temp on the 1197, tried with two different transducers. I do not get my map page or snapshot page. Sometimes it freezes going through the views, sometimes on menu items. I have tried backing up two levels of software up date. Is it fried or ? Thanks