Another customer with a NTL silver 100 modem with the rebooting problems. Think I've counted about 20 people so far with the same modem and same problems.
In the majority of cases, where the customer has had their 100 replaced with a new 'blue' 250 the problem has gone away.
See this thread:
http://www.cableforum.co.uk/board/sh...ad.php?t=38743