Error message when saving a file in AutoCAD2014 on Windows8

I have an error message every second time when I am trying to save my file in AutoCAD2014:

"Unable to save to drawing [file_name].dwg. Drawing saved to [file_name].tmp". Next attempt to save works fine and a following attemp this error repeates. I have reinstalled AutoCAD and still have the same problem. I would appreciate any help to resolve it. Thanks.

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