my wifi printer keeps disappearing from Lion
I recently bought a wi-fi printer (Brother MFC - J430W), and I have two iMacs in the office running Mountain Lion. Both have all the OS updates done. In one of the iMacs the printer stops printing each time I restart the computer (the printer apears in the System Preferences Print & Scan); the printing dialog box displays the message "Cannot find printer in network"; each time I have to delete the printer from the printers list, restart the iMac and add it again.
In the other iMac this doesn't happen, and the printer was added the same way.
Can anyone help me with this? Thanks!
OS X Mountain Lion (10.8.3)