Premiere CC2018 generic error when relinking

Ok , this is driving me crazy , please help

Premiere Pro cc2018

mxf files located on external drive (exFAT)

files are from different 4k cameras (downgraded)

(the mxf files were created using davinci software , for each original file there are three files created , one with image and sound and two containing sound only -if this is relevant at all )

when importing from external disk files would take ages to import (on an imac)

after I moved them in the external drive files would import (almost) fine .

so after I moved the project to another pc there was this particular folder who wouldn't link no matter what (reported generic error)

I copied the folder to another external drive and the files would link fine .

but after I moved the files to another location and tried to re-link them I would get the same error .

I copied the files again to another drive and the problem was solved .

I tried to trash the preferences etc but that doesn't seem to solve the  generic error problem .

Any suggestions ?

I'm on the edge of a mini nervous breakdown , cc2018 has been giving me all sorts of crazy problems