while leaving my neighborhood this morning, I hit a speed bump, not too hard...I was going less than 20mph. I heard a ding, and then my outside temp display started flashing. it showed 5F, -10F, 13F, 0F, ..., and jumped around before settling down to the correct temp (70F). a little later in my drive to work, it did it again after hitting a small bump in the road. what's going on?