MS SQL keeps crashing

I don't know why my mssql server keeps on disconnecting. Before I sleep the slq server is online but when I wake up I have to start the mssql server again. I'm using contabo vps. I don't get this kind of problem when I'm using Azure VMs, my sql server never gets disconnected in azure even if I leave it for a month.

I just found out that someone is always trying to login in my slq server. IP is 103.110.132.153 It's from china. They have a website if you enter the ip in the url bar. 员工登录 - Powered By 简信CRM

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and in malaysia 121.121.141.225