Did you check download to different directory?
Does the CRC error happen again on the same file? Reset and it will again end in CRC?
Can you send us logins and example links to
support@jdownloader.org then we can check it.
My guesses:
-deepbrid may serve a different file (can be tested by downloading via deepbrid and then normally without multihoster and compare both files)
-memory issues (can be tested with memtest86)
-network/nas issues (can be tested by downloading to different destination)