Been using this in a grind session due to how quickly the mission can be completed and just now a couple of brigand "stomp" cruisers are there now that just stomped me Out in 20 seconds or so. Just got out of a red alert, wondering if that may have affected it albeit I've been out Of team for 10 minutes and I'm still getting stomped.
...changed for f2p to make the mission take 500 respawns and 8 hours?
Is it possible that your difficulty setting for missions in progress has been increased? Or maybe someone in your group had theirs increased before you started? That sometimes increases the number of adversaries in a mission.