It takes about a year and a half to ID the "bugs" and get the "fixes" in production.
Then by the third year they start the cost reductionsss$$$$. Then the quality decreases along with it....
Then the last month of production when the assy plant gets low on fasteners and doesn't want to order a "batch" just to finish a "few more", they stick any screw or bolt that will fit in the hole.....