try this to begin with this its a common problem across servers ATTN FUNCOM / GP: Here's your workaround for players stuck in "Lost connection to server" loops. Also, (some) help for players with this issue
The IMORTANT STUFF : If you are running a dedicated server and need a copy/paste example, you can add the following lines to your …\ConanSandbox\Saved\Config\WindowsServer\Engine.ini file:
[/Script/OnlineSubsystemUtils.IpNetDriver]
ConnectionTimeout=300
[/Script/HTML5Networking.WebSocketNetDriver]
ConnectionTimeout=300
It won´t have any demerit whatsoever since the only thing it will do is give the players higher chance to join because of a longer time before timeout.