windows server2012 standard Why always log out automatically?

Question

windows server2012 standard 在远程连接的时候出现黑屏然后自动断开连接，过几分钟再连接就已经注销过了，有时候远程连接上去后画面重叠卡顿然后自动断开连接注销了，哪位大佬遇到过这种问题？谢谢啦

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Translated from Chinese to English:

Windows server2012 standard displays a black screen when remotely connected and then automatically disconnects. After a few minutes, I have logged out after connecting again. Sometimes the screen overlaps and freezes after the remote connection is connected and then automatically disconnected and logged out. Who is the boss? Ever encountered this kind of problem? Thank you