[moaningmags]

Click on connection above it will tell you what ubr you are on, similar to
cable.ubr01.uddi.blueyonder.co.uk
Can you post that here minus your ip address.

Your modem information is fine, all levels within what they should be.
Do they vary, particularly the upstream power level?

Do you use a router? If so, have you tried a direct connection from modem to comp?

Traceroutes and ping tests would also help.

HTH
Mags