Rekordbox 7 losses file location

I have alot of music files stored on a NAS (more than 5 TB) In Rekordbox 6 I never had any problems, so to avoid problems I try to use Rekordbox 7 on another computer and import the music I needed for now. SO it's a brandnew database. I analize the imported files, put a lot of work into placing the Cue points and align the grid.

Somehow Rekord box losses the file location of lots of tracks. Now you can say, you can use autolocate... that's a good idea! (NOT) cause it will take forever to search 5 TB musicfiles. It happens two times now.... I guess I stay with RB 6.. cause this is not working for me :(