This is a very common Ducati issue and easily remedied. If you check other Duc forums you will find a lot of threads about it. Simply apply one VERY small drop of a good lightweight lubricant (I use MPT-12 Multi-Purpose Molybdenum/PTFE Lubricant and Penetrant) to each "button" on both discs after you wash your bike and your problem is solved. I always let the bike sit overnight before riding to allow the lube migrate around the buttons before riding. The lube will not sling onto the disc surface if you use only one very small droplet per button.