Issue with locating libraries

I have the following issue: when I start up my computer and open kontakt 7 or 8, some of the libraries are not found. This is indicated by an orange exclamation mark in the icon of the library, in the left part of kontakt where you can scroll through your libraries. If I open Native Access, the same orange exclamation mark is at the right of the library, and next to it is a button saying 'repair'. If I click on it, the routing to the library folder is correct, I just have to choose it again and point Native Access to the right folder (which it already shows).

First time I had to repair 20 libraries like this (including the Kontakt Library for example), but the next time I openend it, another 20 libraries were missing in the same way. Any solution for this? The reinitializing / throwing away application support folders doesnt work.