Quite possible for the digital phone to work while your net is affected by cable problems. I had packet loss recently as well (upwards to 80%, was unuseable). Checked the signal levels then called in to see what they said. They noticed the same thing, an extremely bad signal coming in. But yet phone worked perfectly. If the signal is that bad, then your modem also won't sync which means no IP.
Photon, have you done the trick to check your own signal levels yet?
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