Mine did it Sunday.
We were using the Nav to get to my son's away game and got about 4-5 miles from our destination.. you know, the only part of the trip I didn't know where I was, and it just shut the **** off! ..sat there for a minute or two and then came upto that screen saying it was performing scheduled maintenance or some shit.. when it finally came back up the Nav had lost the destination. (-.-)
Luckily I was able to find the place I needed to get to, sense my $55k truck isn't upto the task. Can you tell I ******* hate MFT?