Heat. I've had issues with my Garmins cutting out in the desert summer heat. Have heard the same from a couple other inmates. The units just stop working. Mostly Zumos. Any similar issues with Montana or 276/376?
The units won't re-start until the temperature drops. That's a biggie that should be addressed.
KTM 950 Super Enduro, KTM 950 Adventure, KTM 950 Supermoto
Beta 520 RS, BMW R1200 GSA, Rickman Cafe Racer