The problem could be any number of things, most likely its a resource problem on your server or a connection problem. If its a connection problem, you might monitor the pings and see if theres lots of fluctuation, if there is its a problem with the upstream provider, or your host may be running short of bandwidth. A more likely cause would be the simple fact that a vps probably shouldn't be running a game server. A 12 person Jedi Academy Servers takes up a ton of resources, you really should invest in a dedicated box.
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