Two issues I've seen increasing in the last couple weeks are:
1) I start a search for a party in last stand. The matchmaking system pairs me up with 2 others. The countdown timer reaches 0 and plays the sound effect for starting a match but nothing happens. The match doesn't launch. I can chat with the other 2 players in my party in the chat window. Restarting the game seems to help alleviate occasionally with variable results. I can get paired with a different or the same party 2 or 3 times in row and the same error.
Tonight I had the countdown restart after about 10-20 seconds and the game started but when the loading screen came up for all 3 of us, only I and another loaded in. The 3rd player either Disconnected or was dropped. I have been that 3rd person and get loaded into a game of last stand by myself even though I see the other players loading bars fill up. I also had a 'full' party start with a countdown, but the top slot of the 3 be empty and clickable to invite someone.
2) My second issue, ties in with the last paragraph. I have been seeing people in my party get dropped with increasing frequency. I understand that ISPs and connections can shoddy sometimes and not everyone has great internet. However, when I have it happen 2 or 3 matches back to back, it gets VERY frustrating.
I really love the fact that lag is no longer an issue. I am NOT loving how my teammates get dropped at what appears to be the smallest connection problem.