I have a Logitech MX518, I am using a laptop, and it seems that my mouse will always stop working. The sensor will turn off so I can not use the mouse and it isn't lit. I will then unplug the usb cable and sometimes I am lucky and it will work again. Other times I will have to wait a bit for some reason for it to be able to work. It is the only usb device that I have this trouble with. Any ideas?