I had the problem again a few days ago and here is the log.
journalctl -u smbd -f
-- Journal begins at Tue 2021-12-14 14:17:02 CET. --
Dec 14 14:17:02 LibreELEC systemd[1]: Starting Samba SMB Daemon...
Dec 14 14:17:02 LibreELEC systemd[1]: Started Samba SMB Daemon.
Dec 14 14:17:02 LibreELEC smbd[968]: [2021/12/14 14:17:02.625961, 0] ../../lib/util/become_daemon.c:135(daemon_ready)
Dec 14 14:17:02 LibreELEC smbd[968]: daemon_ready: daemon 'smbd' finished starting up and ready to serve connections
journalctl -f
-- Journal begins at Tue 2021-12-14 14:17:02 CET. --
Dec 14 14:17:10 LibreELEC systemd[1]: Starting Kodi Media Center...
Dec 14 14:17:10 LibreELEC systemd[1]: Finished LEDfix Service.
Dec 14 14:17:10 LibreELEC systemd[1]: Started Kodi Media Center.
Dec 14 14:17:10 LibreELEC systemd[1]: Reached target Kodi Mediacenter Interface.
Dec 14 14:17:10 LibreELEC systemd[1]: Startup finished in 5.109s (kernel) + 13.833s (userspace) = 18.942s.
Dec 14 14:17:12 LibreELEC kodi.sh[1015]: libEGL warning: DRI2: failed to authenticate
Dec 14 14:17:12 LibreELEC kodi.sh[1015]: libEGL warning: MESA-LOADER: failed to open swrast: /usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/dri)
Dec 14 14:17:29 LibreELEC systemd[1]: systemd-hostnamed.service: Succeeded.
Dec 14 14:18:20 LibreELEC kernel: r8169 0000:03:00.0: invalid short VPD tag 00 at offset 1
Dec 14 14:18:36 LibreELEC sshd[1298]: Accepted password for root from 192.168.10.25 port 58172 ssh2
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the smb server box is connected via ethernet, too ?
yes.
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one of this has caused trouble for some users (I guess the first one)
server max protocol ?
server min protocol ?
i tried all compinations from sm1 to smb3. its the same every time.