The biggest thing to happen in Arc Raiders recently (if you don't count the Expedition near miss) was Embark's decision to rework the matchmaking to be more attuned to players' actions in solo, duo, and trio queues. The only problem with having better matchmaking is having to wait a bit longer in queue for the game to actually fulfil this promise.
"Starting today, we'll be testing adjustments to our matchmaking algorithm aimed at improving the quality of your matches," a dev explains in an official blog post. "One thing to note: the algorithm may take a little longer to find a match, since it's now working harder to find you a better one."