Recently my Quicksilver started giving issues with sleep. Often- in fact, almost everyday now- it won't go to sleep. When I hit sleep, the screen dims from top to bottom and a warning says I have to hit the reset or hold the power button. Sometimes it will go to sleep, but then it won't wake at all. I must restart the thing. I've searched here and on Apple's site and have not found anything. Has anyone experienced this? Do you know of any common causes for this? Your help is greatly appreciated!