Did you ever find a solution to this problem? I am also having the same problem where once the server starts running and uses more than 5-6 gigs of ram it locks the mineos docker and refuses to let me connect to the webUI even though I used that to create the server. I have a 1.12.2 server running a custom forge mod pack. Its working great besides the fact I can't load mineos webUI once I launch the server.