Hello Jeremy,

you wrote
Previously it was working just fine, I have had it only since December 2011
so the hardware is working.

It seems something has changed in your network, maybe you can find out what this was.

Possibly another device gets the IP assigned from DHCP, which you are using as a fixed IP for your ProfiLux.

Does this mean I have a hardware fault with my P3 and need to get it replaced, or is this is software / firmware fault?
nothing of both, please check the settings, maybe it helps to change the IP range of your DHCP server