I've just started experiencing this problem since several weeks. The navigation unit just blanks out and restarts suddenly or when it it does work it sometimes misses roads (everything turns into water). The unit also needs several minutes to boot and most of the time the message 'insert appropriate disc' appears. I've bought the newest versions of the discs (CNDV-110MT, 2012 DVD maps) but this didn't fix the problem (I tried switching the language; it works to get the unit working but as soon as the unit restarts it asks for the appropriate discs again). So unfortunately the fixes described a