Vodafone simply resell
Eircom's broadband and put their name on it, so the issue must be down to Eircom. The only thing I can think of is that it could be a result of Eircom upgrading your line from 3mb to 7mb, though your line stats look perfect and I am jealous. Okay, I lie. There is one other thing that may have changed: your modem. Try using your original Eircom modem, probably a Netopia, ...