I have a late December 2016 model S D75. I have been having problems with the speed limit detection freezing at 25 mph and then not changing after I leave my neighborhood. When I try to activate autopilot (on the highway) it drops me to a top speed of 30 mph. I did not have this problem for the first 7 to 8 months of ownership. Tesla claims it is the GPS but it seems to be a software glitch and resolves on reboot. Has anyone else had this experience?