This isn't anything to do with USB vs. Ethernet; I too have been having these problems (Bracknell) since the recent network re-engineering started - despite several calls to Tech. Support (expensive!), no further forward. The CM will spontaneously reboot itself (power light on though), and does this several times in a few minutes - but at other times will stay on-line for several hours. Doing a search this evening, I see this is a 'known' problem with NTL and might imply that network resources aren't sufficient to maintain the link. I'm going to leave it until after Easter and have another go at them, as I'm paying for an 'always on' service that ain't always on
Martin.