Any1 else having GvG lag?

Lately our guild has experienced many losses in GvG matches because of huge lag. Are we the only guild that has the same problem? Our monks can't move, mesmers don't have a chance of interrupting anything and casting spells take 15 seconds. In the best matches half of our team gets Error 7 at the same time. It can't be about our computers, because in HoH things work fine. It buggs us that every time we would make to top 20 we lose three or four people to lag. Without lag winning is easy but with four players it is almost impossible.

Never had a problem

I have been having really nasty lag spikes and disconnects all day. I am trying to establish wether it's my ISP doing Maintenance in Leicester or it's something else.
Considering my ISP has had 3 national maintenance weeks in 5 months...i'd say i need a new provider.