Created attachment 121119 [details]
The corrupted file (line 2, column 31791 of Content.xml)

Occasionally Writer corrupts the file on save, without producing error messages.
In reading, LO displays the following message:

reading error, the sub document "content.xml" in xxx, xxx (row, col)

In my case, the error appears to be a duplication of an attribute on the background color: 
                         fo: background-color = "#ffffff"

at column 31971 of the file (line 2).

After eliminating a duplicate attribute, the file opens correctly.
But Writer continues occasionally to corrupt the file.
(The same problem had happened to me a month ago on another file, but I have with me the corrupt file.)