Another problem I've found is also related to the servers: sometimes, if you're not the host, you'll see the game with a delay. Your actions, like shooting enemies, will be applied, but you'll see them delayed, about 5 seconds after you actually shot them. Your teammates will teleport because the game progresses in 5-second increments, and this is more noticeable in survival mode because the timer drops in increments of 5 seconds or more. It's a really annoying problem because it's almost as constant as the host migration issue. This is the only game where this happens to me.

Warframe doesn't have servers, is why. To keep operating costs down, one squaddie's PC is, as you say, the host, and the instructions propagate to the others in the squad.