I'm now 3 for 3 on having Garmins lock up. The first was an older model that lasted a couple of years before locking up while trying to connect to my bluetooth headset. It was out of warranty so I upgraded to a 1390t
That unit locked up last June, less than a month after I purchased it. It wouldn't reboot past the "Loading Maps" screen even after trying a master reset. Tech Support at that time said it was a known issue and had me exchange the unit where I purchased it.
The third lockup involved the replacement unit (also a 1390t). It locked up today with exactly the same symptoms as last year's 1390t.
In each case, I had kept the firmware updated.
The first two lockups were minor inconveniences as I was already on the way home and knew the remainder of the route. Today's lockup was a lot more inconvenient as it left me 20 miles away from my hotel in Washington DC and 500+ miles from my home in Cincinnati.
Ah well - back to paper for the trip home, then a possible search for a new (non-Garmin) GPS.
Call me disappointed in the quality of Garmin's software.