Happened to me last night after patching.
I know I saw a fix was mentioned in one of the change logs but it's still happening. It was at the start of the 3rd or 4th round of firefight and I had been in the game since the map started.
So far I've been in two matches, spawned into spectator both times.
Looks like your connection to Focus Home Interactive - Official Forums was lost, please wait while we try to reconnect.