Did you try updating the drivers? Every time mine starts acting weird, it usually just needs the newest drivers.
The Intuos Pro is a lot of money, but I noticed a huge difference in my art after I upgraded. I consider it one of the best investments I've made for my art. I'm also told monoprice tablets are very good, if you want something cheaper, but they have issues with multiple monitor setups, so it wasn't a choice for me.