Missing proxies can't relink

Hi everyone.
I started a project. And i made TRANSCODE FILE for create proxy's. All perfect. I quit from final cut X and opened again the project and i have worked with proxy's with any porblem. But the next day when i opened again the porject, Final Cut said's me that the proxy's were missing. And i haven't move any folder, all the orginial media are in the orginial place. I don't do anything different that the last time that i opened the porject. I think that is a porblem with a program because this does not make sense. I don't no how to relink the proxy's, because the files exisist, and when i try trasncode again for force relinke, the progam start to a create new proxy's files. It's abig project and i need a solution for now and for this not happen again. O for relink proxy's in any time. It's very strange. Anyone kwons somthing?
Thank you and sorry for my english

You can not relink proxies, they get recreated, that's the system.

Why do they keep disappearing? Don't know. Are you keeping FCPX open until the proxies are all completed? I.E. are you opening the Background Tasks window to verify this?