NAS drive mapping disconnects after waking up macOS from sleeping

Dear community,

Since upgrading to the latest macOS versions (at least since Ventura), I have an ongoing issue with my NAS shares getting unmapped after waking up my Mac from a sleep. Weirdly, I have one mapping which stays, and the other ones have to be "remapped" by clicking on the Finder shortcut.

This is what I see when coming back from a sleep (all 4 shares come from the same QNAP NAS server):

And after clicking again on the 3 missing mapped drives, I have again this:

All 4 mappings are done through SMB, like: smb://NAS4RDF._smb._tcp.local/claudeNAS

At macOS start-up, I do the mappings via items in the "Open at Login":

I have observed the behavior in detail over a month, and sometimes the mappings stay for a sleeping period of more than 12 hours, and sometimes (and most of the time), they disappear after sleeping for approx. 2 hours. Other Macs using the same drives but older OS versions (Monterey), do not have this mapping issue.

Does anyone have an idea where to start troubleshooting? And what could be the difference of the 3 drives that disappear vs. the one which stays (Multimedia)?

Any help would be appreciated - many thanks in advance.

Claude