Originally Posted by mr-b

Over the past few months I have started to experience strange CM "disconnection" problems whenever I go away for a few days - just leaving my server running emule (very low activity levels).

I have a ntl home 200 Ambit modem and the SNR/upstream power levels look fine as per Robin walker's page. When I return from my trip the Sync/Rdy lights are on but there is no internet connectivity. If I remove my router and connect my laptop directly nothing happens either. However if I reboot the CM everything works fine again.

This last time I checked the CM Event Log and it said:
"No Ranging Response received - T3 time-out"
with a count of >15,000.
This corresponded to the same time that an auto-refreshing page (that I had left active on my server - National Rail departures board http://www.nationalrail.co.uk/ldb/livedepartures.asp) reported that it had lost the web connection several days ago.
What does the above msg mean? A quick google mentioned something about possibly losing an upstream connection but it didn't seem conclusive.

CS prompted me to reboot the modem (which of course worked as usual) and said that they'd have to send out an engineer if it happened again.
I asked them about the above msg and they then just said that the CM would need rebooting if I was away for a few days!