I have a large document with at lot of automatic heading,
table, and figure numbering, a lot of cross-references,
plus the table of contents.  At some point, the cross
references began sporadic craziness.  It normally happens
when I open the document.  When I look, I see that,
instead of inserting a simple cross reference, "Table 3",
Word has also inserted all of Table 2 in front of
the "Table 3", just for kicks I guess.  The field code
looks OK; it just refers to a bookmark "REF _Ref66081527
\h".   If I cut the cross-reference and then reinsert it,
the bookmark changes (REF _Ref68056406 \h) and the file
looks fine as long as I don't close and reopen it.  

I know I've heard cautions to avoid too many bookmarks
(for example, advice not to update the TOC too
frequently), because it causes problems.  However, I don't
remember any information about what to do to fix the
problem after it occurs.  I would appreciate any clues you
might have.  Thanks.