TrueNAS 12 Beta2 NFS errors Dataset encrypted - Sytem rebooted

[Junicast]

Hi,

I just installed Beta2 freshly on my system (see footer).
NFS somehow broke down. It was mounted on an Ubuntu 20.04 client. On the client I got

Code:

ls /mnt/video
ls: cannot access '/mnt/video': Stale file handle

On the server this is in the logs:

Something seems to be scheduled on 1:50 AM. Syslog seems to be rotating for example.

Code:

Aug 13 01:50:57 filer nfsd: can't register svc name
Aug 13 01:50:57 filer Security policy loaded: MAC/ntpd (mac_ntpd)
Aug 13 01:50:57 filer 1 2020-08-13T01:50:57.728006+02:00 filer.libcom.de smartd 2046 - - Device: /dev/ada3, FAILED SMART self-check. BACK UP DATA NOW!
Aug 13 01:50:57 filer 1 2020-08-13T01:50:57.818466+02:00 filer.libcom.de smartd 2046 - - Device: /dev/ada3, Failed SMART usage Attribute: 7 Seek_Error_Rate.
Aug 13 01:51:00 filer kernel: tap0: Ethernet address: 58:9c:fc:10:74:41
Aug 13 01:51:00 filer kernel: tap0: changing name to 'vnet0'
Aug 13 01:51:00 filer kernel: vnet0: promiscuous mode enabled
Aug 13 01:51:00 filer kernel: vnet0: link state changed to UP
Aug 13 01:51:00 filer kernel: tap1: Ethernet address: 58:9c:fc:10:d8:3d
Aug 13 01:51:00 filer kernel: tap1: changing name to 'vnet1'
Aug 13 01:51:00 filer kernel: vnet1: promiscuous mode enabled
Aug 13 01:51:00 filer kernel: vnet1: promiscuous mode disabled
Aug 13 01:51:01 filer 1 2020-08-13T01:51:01.368387+02:00 filer.libcom.de mountd 1927 - - can't open /etc/zfs/exports
Aug 13 01:51:01 filer 1 2020-08-13T01:51:01.369081+02:00 filer.libcom.de mountd 1927 - - can't open /etc/zfs/exports
Aug 13 01:51:01 filer 1 2020-08-13T01:51:01.369896+02:00 filer.libcom.de mountd 1927 - - can't open /etc/zfs/exports

When I tried to mount it again the dataset was locked. The dataset itself is encrypted using a passphrase to unlock it, while the parent pool is set to key based unlocking.

Edit:
well the server restarted, I just check via uptime command, but I have no idea why...???