Cayenne Adaptive Cruise Control (ACC)

[Jimease]

The Adaptive Cruise Control on my 2019 Cayenne stops working when I tow my small (3,000 lbs. weight) travel trailer. It stops about 30 miles after I start driving with the trailer hitched and turns on again about 50 miles after I unhitch the trailer. I have no problems at all with the ACC when I'm not towing. The dealer can't figure it out, once there was a C110300 code (ACC sensor misadjusted), but the sensor had not been touched and the ACC was working at the time. Other times (I've taken it in 3 times) the ACC was working again and the dealer couldn't find any problem. The ACC really helps when I'm towing to keep the speed down without constant attention to the speedometer. I'm ready to get rid of the car if this can't be fixed.