I had the same problem as Humppa, got kicked on Eagle 2 minutes or so after i connected, without a reason. (No that was not a Teamkill kick
)
After a while i was reconnecting without a problem, this behaviour was not there with 32 player i think (as far as i remember)
And as Raziel said, many maps are too smal for such huge number of players. But thats leads me to a question, qhat aboput kingdom_rc4 in custom map votes?
Thas a big one and can easily replace the normal kingdom