Infinite loading screen when joining my dedicated server after mission launch (while there is no problem with most players)

[CoolSpy 9]

Hi Folks,

I got a problem which drives me crazy. We have a dedicated server running with 60 mods, all works fine. We create a mission, everyone is able to join fine. But when the server has been up for a few minutes, SOME people won't be able to join anymore (they can when server is fresh) and got the infinite loading screen (black with horizontal scan lines).
90% of other players have no problem joining when it happens though but SOME can't unless the server is restarted. Any clue on how to fix that please ?

Is that a mod loading order issue?

Can I look somewhere on the logs to see what the problem is ? (if so, where?)

 

TIA guys!