NHTSA Complaint #11498481 — 2022 TESLA MODEL Y

While driving with Autopilot engaged at approximately 65 mph the car suddenly decelerated to less than 40 mph and then accelerated back to 65. This happened again within a minute of the first occurance and I turned off Autopilot but left cruise control on. It then happened again and I turned cruise control off. Fortunately there were no cars following close behind me nor was I following close behind another car. In the first two cases there were intermittant shadows across the road cast by trees along the road side. In the third there was a large black programmable traffic information sign 20 ft or so off the side of the road that had no information displayed. There was no damage to the car or injuries to the occupants. The vehicle has not been inspected by the manufacturer. No warnings were displayed prior to the event.