I'll add that it randomly brakes hard on the interstate because it thinks the speed limit drops to 45. There aren't speed limit signs anywhere nearby on different roads that it could be mistakenly reading either.
I noticed that this happens when the triangle on the map is slightly offset from the road, which I've attributed to miscalibrated GPS. It happens consistently when I'm in the right lane and pass an exit when the triangle is ever so slightly misaligned.