Yeah in a group of 7 players I've experienced disconnection issues: I can connect to friend's server but it drops me very soon after. Disabling crossplay might have helped a little but nothing conclusive. We also have lag spikes/low fps when many things are happening but I've previously just assumed that it might be hw limitation. Anyway, I've rebooted the game/steam or whole computer and then randomly the game decides that the connection is good and I can usually play the whole session without problems.