You may want to check out NHTSA's Office of Defects Investigation complaints database about this problem ==>
http://www-odi.nhtsa.dot.gov/complai...aintsearch.cfm.
Although you probably won't find within their database why this happens, you will find out that you're not alone.Many, manyAudi A4 owners have logged similar complaints, and I would find it hard to believe that the Avants problems differ greatly - if at all - from those of the A4.
Best of luck.