Start with a question... lol Have you checked the obvious - the IP address and subnet of the printer - to make sure it is not clashing with the superhub?
Continue with a question..Have you tried altering the IP address of the printer to a number outside the normal range used by the PCs or if possible setting it up to be a DHCP client
Only other option is to change from DHCP to static IPs and set it all up to be in the same IP range as the printer (assuming that the printer cannot have its IP changed ot DHCP client set up on it)
Dont know if any of these options will help you, but I would guess that in some way it is IP related
Also when you check in advanced on your superhub on the status page - check that the software version ends in R26 - they did an update last month, and somehow mine didnt accept the update, and started to play up - until the VM engineers managed to force an update during a phone call to them