Last week my Windows Server 2012 "server" service has a daily crash after lunch time. The effect is that all network shared folders becomes not accessible. I solved restarting the "server" service, sometimes I could not stop it and I had to restart the VM.
What really sounds strange for me is that it happens after lunch time.
Looking inside sessions and open files of the server share I saw that randomly some user had hundreds of opened folders. Users with high n. of opened files change randomly and when I asked them how many folder were they using they replies just a few.
Users of my company use all the same mapped network drive.
I really don't know of this opened file fact has something to do with the server crash.