This weekend we took a long drive in the country and at first I noticed the navigation indicating a no GPS signal. The longer we drove the Sync system ran slower and slow to where there were very very slow button responses.. The navigation instructions cut in and out. The radio would mute for the navigation instructions then would not unmute... Did a master reset when we go home but the next day the problems continued. Our MKC has been a pretty good ride up until now. Getting very frustrated - I still have a year and a half of warranty but I'm starting to worry about owning this thing beyond the end of the warranty.