Polecatt

I think the idea is that replacing the entire radio will be a “proper” and permanent fix to the issue of memory corruption of the detailed map data, however it’s not guaranteed since the replacement unit could fail in the same way. 
 
reflashing the map data will fix your problem, until it gets corrupted again.  I had to flash it once... hasn’t been a problem since.   If it ever gets corrupted again, I will follow the same procedure using the map data I already have to restore the maps. 
 
seems like that is the best approach. 

So I had my 2015 Journey in to service a leaking CV axle joint a few months ago and to my surprise when I was swapping out my summer tires for the steel rim winters today I found that there is no CV axle nut on the shaft they worked on.  Any thoughts on how that might have happen and what sort of risk or damage the vehicle might be subjected to when driving for a few months with no CV axle nut?