The ‘search’ function has been (and continues to be) a big problem on FR.
For most searching, I use Google and restrict it to “site:freerepublic.com” [without quotes or use the advanced search feature].
FR used to restrict the Google type search engines from accessing the articles/comments, so articles from that period may not be Google-able.
As an alternative, you might try searching the Web Archive
http://web.archive.org/web/*/http://www.freerepublic.com
I keep encountering that problem with most of my old bookmarks, and usually- usually, hitting F5 or refresh repeatedly will get it to load.