My M3 went in for service the other day for a leak in the battery coolant line. They replaced a hose and a fitting and added 3 gallons of coolant. 2 days later when I get the car back I see this in the display. Erratic display of passing cars. I had a little of this before but now it's terrible. What do you suppose happened? It's as though they cranked up the sensitivity of the sensors way too high.