My X has AP2.0 / HW2.0 and when I turn on the ACC (Adaptive Cruise Control) about 15% of the time when I approach an overhead sign on the highway it sees the sign suddenly as a vehicle (red) right in front me, beeps and starts to decelerate very quickly. This is most disconcerting and a potential Safety Issue if someone is following closely behind. Has anyone else had this issue? I wonder if it is a camera framing / calibration issue or a software bug? I have reported this to Tesla to see if this is a common issue, but no response yet. Thanks!