[Creep]

Thanks for the information Chris W.

In fact, the modem cost me £150. Still pretty hefty though.

I was under the impression that the CMX provided diagnostics when something goes wrong ? However, I fear you maybe right in this situation in that temporarily losing downstream/upstream would probably not be classed as an error by the modem.

I haven't contacted NTL yet. I want to be satisfied where the problem lies. This is so I can rule out the bits my side like the firewall, PC hardware, cables etc...