I recieved two Jot Pros through the original Kickstarter campaign.  These both had the "Cross" style Disc.  Recently one of the Pro's started skipping horribly.  I've used the cleaning and aluminum foil methods others have mentioned here before.  The aluminum foil works well but eventually the foil sort of crumbles and falls out and it begins skipping again. 

I decided to purchase replacement discs thinking that perhaps my original disc is simply worn out.  I recieved the discs but they look different then the original discs, they have no "crosshairs" on them and look more like the Jot Mini discs (same size as the original but a larger metal circle and no crosshairs).  Has Adonit Modified the Disc for all Jots, or did I get incorrect discs for my Jot Pros?