NHTSA Complaint #11461179 — 2022 TESLA MODEL 3

I was driving southbound on Interstate 5 in California mid-morning on Friday, April 15th. Adaptive Cruise Control (Tesla "Autopilot") was set somewhere near 75mph. There was no other traffic anywhere near our vehicle (at least 1/2 mile clear both ahead and behind). There was no debris of any kind on the road or on the side of the road. The car suddenly and unexpectedly began heavy deceleration. It felt as if the vehicle was performing an emergency braking procedure to avoid a front collision. Fortunately there were no vehicles around, so other than startling me, there was no other incident caused. Had this occurred with a vehicle behind, it very likely would have caused a rear-end collision.