I've recently found, for just one folder in my library, that when ever the regular maintenance runs it removes all the pre-transcoded files(or at least the links to them). Normally I run maintenance on the whole library at night, but I have tested this where I will pre-trancode even one file in this folder, verify the transcoded file is there from the properties, then I manually run the maintenance and check the properties again it's gone. I have several other folders with pre-transcoded stuff in it and they are fine, it's just the one folder that I can't keep the transcoded files for.

Any ideas why running maintenance would be removing the transcoded files/links?