99% of the time the computer is fine when I put it to sleep. I open the lid when I'm ready to use it again, and it wakes up instantly. The other 1% of the time I open the lid and nothing happens. I have tried hitting keys and moving the mouse to no avail. When this happens, the little light on the button that opens the screen stays dimly lit. The solution is to hold the power button down and let it restart. Is this a common problem to have (again, like once every few weeks) or is there something that I'm doing wrong?