Once or twice a week while driving 10 to 15 mph in an open parking lot or side street the seat belts will violently retract as if the car thinks we're about to be in an accident or something. The belts will remain tightened for 5 to 10 seconds before releasing the tension and going back to normal operation. This is only a surprise when it's the wife and I in the front seats but then when it's the 91 year old Mother in-law or the employee who is 8 months pregnant it becomes a much more serious matter. Anybody else having this problem? 