Why does my iPhoto library keep losing thumbnails?

I own an external Hard Drive containing my photographs and in the past 2 weeks, my iPhoto thinks it's a good idea to lose all of my thumbnails for my photographs.
When it tries to rebuild itself, nothing happens and remains the same and when I do it myself it's the same thing with no result. Had to create a new library but lost all of my photographs and when I redirected to my original library all photo's appeared!
Thought it was my hard drive but it seems to be working fine as my music library is on there too and seems to be working fine?
Is this an issue synonymous with iPhoto and has anyone experienced this. As a freelance photographer, this is rather annoying!
Thanks for reading,
Stevie.

Thanks for the info guys.
The Format is Mac OS Extended (Journaled).
Just to let you know, my iPhoto Library did the same thing again where all thumbnails were missing. When I select an album to view, the pictures appears as cut outs similar to when first importing.
To resolve this I had to select another Library I had setup then re-select my original library where all of my photographs appeared.
Really not liking this system as I'm worried it may cost me money in losing the work of my clients. Appreciate your words of wisdom and advice; one and all.

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