Access via https on MAC os

Hello, I Have problem with the availability of the storage .I use Mac OS El Capitan.
Constantly lost shared folder. Add it as a server
. If you add the repository by FTP using the finder set not see new files, only those which were at the time of accession. Today used s FileZilla, everything works fine. Really want to connect through https/
has Anyone faced such a problem ? However, other neighboring PC Mac and Windows work fine.

I haven’t try that. Let’s see if any of the users can share some information about it.

If I connect to the NAS as a server.
A folder appears in the finder and I can open it. But after an hour or less, it disappears. You can add it again, but the result remains the same. When connecting folders from other storage, everything works fine