| I had the same problem on my 996 a few years ago.
I have tried to search the old board for the thread but its not there, the old board, so from memory.
The rear sprocket carrier is held in place by a circlip spacer that sits in a machined groove in the sprocket carrier assembly.
With time this circlip wears the recess and allows the sprocket carrier to move which allows the sprocket carrier to chew the eccentric hub away.
there is a later eplacement spacer that does away with the circlip jobbie and Ducati know about this but they diod not do a recall but luckily mine was under warranty.
If you have caught it early enough your eccentric will still have enmough ali left for you to adjust the chain, if not its a full replacement and the new spacer will be required too.
HOpefully though it might just be a cush drive outer sleeve thats backing out of the carrier and you will just need the cushdrives replacing.
Either way its lucky you found it before it grabbed the eccentric and locked the rear wheel up whilst riding!
Good luck.  | 
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