On my road bicycle, My Cosmos freehub (2003) has decided to die. After 6000 km they started to skip a bit, by 8000 km they where skipping allot. Now at around 8500 km there are times the hub does not work at all.
My guess is that the grease is broken down or dirty. Which results in the interior parts from no longer moving.
The Mavic Cosmos Wheelset is a fairly good entry level wheel, the rims have Mavic 6106 marked on them, which have stood up well expect for some minor adjustments after 4000 km.
My LBS suggested I sent it to Mavic and they would charge me an upgrade fee in exchange for a 2004 Cosmos hub. Currently I am researching for a more reliable rear hub.