send in a ticket - it would help if you could add some extra info to help them find the cause - many of us are having multiple cyrodiil disconnects, and then it's ok for a while - then starts again

where in cyrodiil were you specifically
what were you doing
was the disconnect instant, or were you still in game on your screen but not able
to shoot at or interact with anything
did the entire party disconnect, just some of them,or just you
did messages in chat stop showing up
how many were in your party
was the party all together or spread out over several locations
find out if anybody that was in the party, had joined the party itself before entering cyrodiil (we now run 24 man groups constantly and only invite from cyrodiil zone chat - the large party disconnects that we always had, have dropped to an insignificant amount now)
anything else you think might be helpful

the disconnects in cyrodiil are probably the biggest issue for many folks - pain in the arse as it is, sending this info on can help them make the game better for us

ty

D.