Sphinx works fine on our forums when displaying results as threads. Displaying results as posts however returns an incomplete set of results, but only with terms that occur often (which is not hard with > 8M posts

). On top I get results with a match on the title only (why..?), and those are followed by older results with a match on posts. Recent posts seem to be missing in the result set.
Any hints on how to get the search to behave properly?