Server Crash Quick

[:D]

Hello, whenever I start a server it seems to crash after about 3 miniuts for a random reason of wich I can't find out, It realy buggs me seeing as I want to make a server online so people can join, But I can't.
If you can help please respond. Thank you.
Extra Info: They Have allways crashed when I build.(but hey whats the point of havingg a server if you cant build?)  They freeze my WHOLE computer.

Sincerely, :D

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[Lord Elavier]

That used to happen to me but I fixed it...dont no what the problem was and accidently fixed it  but here are some reasons it could be happening

*You have a extremly old computer
*You didnt foward the ports right
* You multi Account (give the Auth code to other people or other computers)

Well , dont no much but hopes that helps!

[:D]

Oh well i do have multi acount its on my old computer so ill just remove it hopfully it works thx!