Both printers connected to my HP desktop (win 7x64) via USB ports become inaccessible (cannot print) if the computer is left on for a day or more. When I look under Devices and Printers, it shows both printers with the troubleshooting icon (Status: needs troubleshooting). When I initiate troubleshooting, it comes back with - "troubleshooting could not identify problem." I have to reboot computer to get printers working again. I need help to solve this problem.