File Saving on server

I will have a drawing open for a couple hours.  Then someone else on the server will open up the same file that I already have open.  It will not tell them to open it read only so they will have full permissions.  I will then say that when i go to save it that it is read only on my computer.  Any idea of why Autocad does this?  It has been doing it for 3-4 years on me.  I was also told by another coworker that it happens to then even if they start a new drawing.  After a little while when they go to say it Autocad says its read only.  So I am baffled as to why it would do it on a brand new drawing not even saved yet.

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Image may be NSFW.
Clik here to view.