Excel shared workbook copies rows by itself
 

An Excel workbook I share with one other person copies rows by itself. Today
I was the only person in the workbook, and I viewed it without making any
changes. At the end of the day I found multiple rows that had been
duplicated up to four times. Neither myself nor anyone else copied these
rows. Excel did it by itself. This has happened on a regular basis for
years in this and other shared workbooks, but not in all of my shared
workbooks. I don't have any macro's running that would cause this. In an
effort to elimnate this problem I've copied all of the data from this
workbook into a new one. This didn't work. Any ideas?

Greg