About 5 or 6 weeks ago, a truck passed, heard a sharp noise, and a little later noticed a little star shaped chip on the car window? Think I've heard that this could be a problem, but didn't act, now its got about 4" cracks radiating from 2 of the star point ends. Yikes! Is it too late for an economical repair? Is the best repair (considering quality and price together) from a dealer in the particular brand of car, or from an auto glass company. Any experiences?