System.IO.IOException: Win32 IO returned 50. Path: --- Sonarr (+Radarr) fail to copy completed download to /mnt/ftp

Sonarr version (exact version): 2
Mono version (if Sonarr is not running on Windows): 6
OS: ubuntu 16.04.6
Debug logs:
Description of issue:

All was working fine.
Radarr, Sonarr, SABnzbd.
remote server is connected via curlftpfs mounting /mnt/ftp to provide /films & /tv to a remote NAS.

then the copying of files post download into /mnt/… failed. with the following error

Couldn’t import episode xxx/Downloads/sabnzbdplus/complete/tv/Ballers.S05E04.Municipal.720p.AMZN.WEB-DL.DDP5.1.H.264-NTb English/580367ab890c41b7bba9e7f09d6f7609.mkv: Win32 IO returned 50. Path: /mnt/ftp/TV/Ballers/S05/S05E04.Municipal.WEBDL-720p.mkv.partial~

have rebuilt the server and installed twice.
checked permissions on ftp
tried moving /mnt/ftp to /home/… and that works, so copy is working locally. just not via the ftp mount.

this is with RADARR and SONARR. they have both written and deleted the test file post install and config etc, checked on ftp logs

on adding a new film/tv the root directory (title (2019)) is created , its the copy that fails after download.
I can do a manual move (mv) of the file

if I do a manual file move after download it works (mv download.mkv /mnt/ftp/folder/downlad.mv) it works !! WTF

stuck now…

Mono 6.x has a few issues, might be best to downgrade to 5.something

I’ve tried to downgrade mono to 5.x but it seems the library or whatever is pinned to the latest.

how do I downgrade ? searched but seems to be no correct answer

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