R815 halt twice or more in a day

Hi everyone 

I have dell poweredge R815 server and I am facing an issue with it. The issue is that it halt twice and sometime trice in a day then I go manually and restart the server. Which affect our production badly.

Now I don’t know what to do and to whom to contact for this issue. I am posting  if someone have solution for it or someone can redirect me to the right forum for it 

Thanks 

Ihsan u