8500 N911g connected via usb on Win7 takes Network Printers offline

Can anyone help, we bought a bunch of these printers and users are using them at the office.

So current 8600 plus printer connection is via usb.

We have users on the network using Windows 7 with it.

It takes all Network Printers offline, you can still print using 8600 printer but not the network printers until you restart the Spooler. Once you reboot, same situation, local 8600 can print but all network printers offline?!!!!

8500 N911g connected via usb on Win7 takes Network Printers offline.

I never seen issue like that, we could not utilize it for the wifi and now this issue common HP?

Please HELP ASAP.

Thank a bunch,

Mark.