Rock64 v2 as Openmediavault server - buffers / shutdown problems

[helpmerock]

For Rock64 Ver2 (1GB ram), I installed OMV using Guide: Installing OMV5 on Raspberry PI's, Armbian SBC's, & i386 32-bit platforms: Link: https://forum.openmediavault.org/index.p...platforms/

Thanks to the guide, it's easy to install & starts working.

However, I can not shutdown. With either webpage shutdown command OR SSH shutdown command or connecting keyboard & monitor and on consol, in all three cases - it restarts instead of shutdown. 

 2nd try:
I install the same thing again on another SD card but the same problem - can not shutdown - always reboots.

Transfer speed from Windows 10 to OVM is about 90 to 95MB/s in write & 65 to 70 MB/s (USB3 external HDD)

Sharing video files from OMV to Kodi & vlc on firestick 4k, NO buffers. works great.

Now,

I tried from OMV: https://github.com/ayufan-rock64/linux-build/releases/ - It works & shutdown too.

Transfer speed from Windows 10 to OVM is about 95 to 105MB/s in write & 75 to 90 MB/s (higher than previous installs)

BUT, while sharing video files from OMV to Kodi & vlc on firestick 4k, buffers a lot & it's unwatchable.

How I can achieve the best of both worlds?