If you are transcoding and using a docker, then check out the Plex problems video.
Fix Plex and OpenVPN-as Problems by Removing Noexec on Openmediavault
i edited that "noexec" part of code before i even posted here, with no changes, after restart was the same (and yes i did check if the changes were made)
PS: while editing 'noexec' i found that code was present on all my HDD, so even if i delete from all HDD, i had same problem