USB disappears?

I've got a USB printer - HP PSC1200 - that works fine with SuSe 9.0. However, after a while, the usb port usb:/dev/usb/lp0 becomes unreachable. Up till now, the only remedy is to remove the printer (with Yast2), reboot and reinstall the printer. When reintstalling the printer, the port usb/lp0 doesn't show in the list (Yast2), so I need to add the port. After this the printer works fine again, until the next time. My guess is that is has to do with the USB department. Any ideas? Hans Rasch