I play both CS and RM, I used to open both lobbies but lately if I do, Voobly crashes. Now in MS lobby I can't even join rooms to spec because it instantly crashes. Doesn't happen in CS lobby or other smaller lobbies. I'm guessing it has to do with the numbers of players online.

I've already re-installed Voobly and done what Chris has posted on other similar threads, it hasn't fixed the issue.

We reduced the number of game rooms again in our main lobbies (New Player Lobby 1 and Medieval Siege 1). This will hopefully reduce the amount of crashes you are experiencing. Please report back to us, whether this improved your situation.

Furthermore, Upon entering/creating a game room for he first time, please wait a minute for the NAT handshake to occur (between the client and the server). The time this takes depends on the system you are using and the amount of players. Please report back to us, with more information, whether our suggestions worked or not.

It seems the issue is now gone! Today I was able to join both lobbies at same time without a problem and spectate games in MS lobby without crashes. Thanks for the help

Glad to see you're able to play again without issues.

Cheers,