Interesting. My GMX-200 reboots itself randomly during the warm months. This is preceded by the map display momentarily showing my position in incorrect locations in the general vicinity, repeatedly and at increased frequency until the screen goes dark. The crashes happen much more frequently if the display is on a graphics page, especially the map page. Rarely it shuts down with a message that I think indicates a General Protection Fault or similar.
It's going back to Garmin in a couple of weeks, hope what was said above isn't true and they will be able to fix it. The unit is fed by both my XM weather receiver (GDL-69) and ADS-B in (GDL-90), thus I have neither weather nor traffic without it.