You can try resetting the network settings on the machine and then re-input all the settings into the bizhub I have had a few machines that when something changed they show the new settings but for some reson they dont work and I have done a reset and then re-input the settings exactly the same and it then works.
try this first, also do a full reboot of the device.
I did mean the units IP, I'm trying to figure out if it is the Router/Modem or the Bizhub itself.