I have discovered an interesting problem. A Coca Cola night light(Liquid, filled with glitter, sort of a lava lamp effect.)plugged into the same outlet as computer, when turned on interferes with cordless mouse. My mouse seemed to, for no reason, began to work intermittently, the pointer skipping around the screen sometimes not moving at all. Tried many things, nothing helped, until I turned off night light, problem solved. Logitech LX7 Cordless Optical Mouse. FYI