Could be the bearings are done. If you search there are many sites that offer bits, including Bosch.http://www.ereplacementparts.com/bosch- ... _3220.html
Not sure if this is for your router, but you can see what is available. Oddly, the bottom bearing is shown as obsolete for this router ... maybe bosch specific.
If you get teh specs, VXB.com has a lot of bearing types ...