Yesterday on a trip from Indianapolis to South Bend and back the TACC would intermittently slow the car down for no obvious reason. There was not a car close enough in front to cause it. Driving conditions were remarkable for fairly high wind; sustained at 25 mph with gusts into the 40s. This is the first time the TACC system did not perform flawlessly since I took delivery in June. I was not using lane keeping due to poor lane markings on US 31. Has anyone else experienced similar behavior? Today on my normal commute everything worked fine again.