My lane change blindspot monitoring seems to be malfunctioning. About forty percent of the time it beeps when I use the turnsignal saying there's a car there when I'm the only one on the road. No objects nearby like guardrails or curbs. I often am driving and the blindspot light will be on in the mirror for no reason I can see. Is the sensor defective or do I need to adjust something? Known issue for anyone else? Time for a dealership visit?