Word document open by another user

Is there a reason why Word 2013 would say a file is locked by another person when it isn't? Then when I close the document and re open it its fine? Only thing I could think of is the nightly backup causing an issue.
Technical InformationAsked:
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Does this happen all the time? This usually happens when (https://support.microsoft.com/en-us/kb/313472)

    Word previously quit improperly and, therefore, did not delete the owner file.
    A second instance of Word is running in the background with the document already open.
    The document is shared over a network, and another user has it open.

I dont think it has anything to do with your backup process. Closing and reopening the document in Word helps it to rectify this issue where possible.
I get a similar problem with Word 2010 (try to save a file only to find out it is read-only) the first time I noticed it was after joining my PC to a domain (Win Server 2008).  I'm not sure what the cause is, the file is backed up to BoxSync and also to the Server.  Closing and opening always seems to fix the issue, but usually I've edited so I do FileSaveAs.

One thing to check, next time it happens goto the VBA IDE by pressing Alt+F11 and see if the file (or perhaps a template) is listed twice in the project explorer.

Another thing to check Ctrl + Alt + Del and go to processes and see how many instances of WinWord.exe are running...

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@MlandaT - snap!
Technical InformationAuthor Commented:
Brilliant - Ill try that thanks DrTribos
No worries, share your findings!
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