LO Writer page numbering resets itself halfway through document

Dear all,

I am not sure what to try anymore, so hoping that anyone on this list can
help please.

I have a long document (thesis) in .odf format, and the page numbers reset
themselves to 1 after page 170 or so (the page where the page break occured
sometimes changes, but even when I temporarily resolved it -see below- a
random page break or two always came back).

To resolve this, I have

- deleted and re-inserted page numbers several times (issue remained)
- searched for visible page breaks between pages (there are none)
- checked in the "format"/"paragraph"/"text flow" tab whether the first
paragraph on the reset page had the "Insert Break" box checked (it didn't)
- looked for the same in the paragraphs before and after the invisible page
break, but couldn't find anything.
- uninstalled and re-installed LibreOffice Version: 4.2.7.2 (that fixed it
at first, but then the same thing happened)

I would be massively grateful if anyone could help please, as I'm not sure
what else to try.

Many thanks,

Svenja