I just found out a couple of very nice Cricut tips on Leigh’s Little Blog.
One that I found particularly useful is this:
Another little thing I do when my mat is starting to lose its stick is roller over the cardstock with a clean brayer. It helps to apply an even pressure for rubbing the card down. There is nothing worse than starting a cut for the card to come dislodged.
Make sure to check her blog (linked above) for the full post.