I know lots of people have had scrolling issues with their Mighty Mouses. My problem is, it just stops clicking. It "moves" fine (moves the cursor around), the red light is on, everything seems to be working. I even unplug it and plug it back in. No clicking. Finally, I have to restart the computer (by holding down the power button on the back of the iMac) and then it will work again. Any ideas? It does this usually when I haven't used the mouse for about 30 minutes. Is it the mouse or the computer?