I have a Xerox WorkCentre 6655i which now automatically wake up from sleep mode every 5 minutes. Before it always wake upp 24.00 every night. That was enough annoying. I have tried to search every menu in it but can´t find the reason. I also take of the network cable to be sure it´s not some device on the local network frequently tries to contact the printer. But it still continues to start up every 5 minutes. After 1-2 minutes it go to sleep mode again. The only way to solve it is to turn it off and turn it on every time i need to print. With all this kind of problems i have had with Xerox printer I am pretty sure it will be another brand next time I change printer.