I did a little more investigating. Popped out (street's SWARMING with U2 fans) for a couple of hours and just got back in and it's on the blink again.
Before i reset it (feel like stamping on the bugger) i checked some stuff.
I CAN still ping the ip address assigned to me.
i CAN ipconfig /release fine.
i CANNOT ipconfig /renew.
i CAN take the ethernet cable out of the modem, slam it into the xbox, change the IP address and ftp into the xbox no bother.
i put it back into the modem, changed it back to automatically be assigned an IP, and nothing. Can't do a repair. (i assume a repair just does a /release /renew)
The ONLY way to get connectivity back is to unplug the modem for a few seconds and reboot it.
It DOES seem odd that two modems give the same problem, so the problem must be on the other side of the modem somewhere.
If it happens again tonight i'll phone them WHEN it's on the blink. Perhaps that will show up something from their side.
Any other suggestions, people?
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btw, the current power levels are
Downstream Receive Power Level : -6.9 dBmV
Downstream SNR : 34.1 dB
Upstream Transmit Power Level : 53.0 dBmV
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judging by what it says
here
the downstream receive is very much on the boundary of acceptable, and the upstream transmit is iffy too...