NHTSA Complaint #11472524 — 2022 TESLA MODEL 3

While driving on the interstate and having the adaptive cruise control enabled, the vehicle unexpectedly and suddenly decelerated with no vehicles in front of us. This happened 3 times over a two day period, with a total time of about 3 hours having the cruise control on. The 3rd time it happened, we were traveling at about 75 mph with another vehicle behind us, no more than two seconds behind. No vehicle was in front of us, but our car suddenly decelerated by about 20 mph. If the driver behind us was not paying attention, they would’ve rear ended us. I sent in a service request to Tesla. The answer was, in summary, they are aware of this issue with their beta version of adaptive cruise control and are working on a firmware update to fix it. The solution given, in the meantime, is to disengage the cruise control when it happens. This is unacceptable to me, as the consequences of sudden, unexpected deceleration will have already happened. I am not going to use the cruise control until it is fixed. For such an expensive car, still under warranty, an unusable and dangerous feature should be fixed.