general problems of the 1996 Infiniti I30

While driving on a clear day, no wet road, etc. , on Saturday September 4, 2004, my 1996 Infiniti I30 mysteriously went out of control, went into a slide, crossed a two lane highway, went down an enbankment, flipped over, and crashed top-first into a tree; driving the roof into the driver's seat. The airbags never did empoly. The investigating officer did not issue a citation since he could not determine the cause for the car going out of control. I was checked for sobriety, etc. And it was determined that I was not impaired. All tires were in excellent condition, there was not a tire blowout. The front was aligned about 6 months ago. The tires were recently rotated and balanced. The right front tire was replaced at that time because the tire had a slight indentation due to possibly hitting a side walk curve.