Shared Links are changing after a while

Hi,

we are facing some problems with shared links.

We create a shared link with password on a folder at a SMB/CIFS storage (Windows Server 2016).

We can access the link with the set password.

After a few weeks (8-12 weeks) the link changes. When we log into nextcloud and navigate to the folder we can see, that a share exists. We can copy the link to the clipboard and it differs from the original link a few weeks ago.

We can access the new link with the set password from the old link.

Anyone else having this problems and/or having a solution for this behaviour?

Nextcloudversion: 15.0.5
Ubuntuversion: 18.04.3 LTS
Apache: 2.4.29

Thanks in advance