new hotfix today was meant to correct those problems, but it seems there haven't actually been any meaningful improvements.
"Unfortunately it looks like today's patch did not fully resolve the BTB matchmaking problems," community director Brian Jarrard says in a forum post. "The team is continuing to investigate and while we believe there may be some minor improvements, matchmaking is still not working as expected. Many people worked hard to get this fix out the door and it's naturally very disappointing we're not seeing the desired and expected results. We know this is an ongoing source of frustration and the team will continue to work towards a resolution."
There's no word yet on how long a follow-up fix will take, but it seems that 343 Industries is having a difficult time tracking down the source of the issues. Regardless, the promised set of five bonus XP boosts and challenge swaps still went live today as scheduled – you'll get those if you anytime between now and February 16.
For now, Jarrard adds that the idea of disabling BTB-related challenges is "being investigated".

The FPS game.