You are not alone. I have been investigating the issue for the past few days without success.
[edit] here is what I tried:
1) Updated to mainline on OMV (armhf)
2) Limited SMB to SMB2
3) Tried NFS
4) Tried GbE and Fast Ethernet
5) Tried steaming via Plex's DLNA
6) Tried different players - e.g. VLC also behaves this way
None of the above solved the issues.
I have both of my HDDs on the OMV install mounted on my Linux box, and when streaming movies directly from the mounted folder using MPV I have no issues.
[edit2] So now I spent the better part of my free time today looking into this. I have come up completely empty handed, but what what I can say with certainty is that KODI on Android TV works much more reliably than when streaming to LibreELEC. That said, its spotty. Sometimes it works well and sometimes it doesn't.
KODI on a high-end PC, on two different SBCs (one Rock64 and a RPI3) as well as Android TV for Rock64 exhibit the same issue when streaming from RockPro64 OMV.
[edit] here is what I tried:
1) Updated to mainline on OMV (armhf)
2) Limited SMB to SMB2
3) Tried NFS
4) Tried GbE and Fast Ethernet
5) Tried steaming via Plex's DLNA
6) Tried different players - e.g. VLC also behaves this way
None of the above solved the issues.
I have both of my HDDs on the OMV install mounted on my Linux box, and when streaming movies directly from the mounted folder using MPV I have no issues.
[edit2] So now I spent the better part of my free time today looking into this. I have come up completely empty handed, but what what I can say with certainty is that KODI on Android TV works much more reliably than when streaming to LibreELEC. That said, its spotty. Sometimes it works well and sometimes it doesn't.
KODI on a high-end PC, on two different SBCs (one Rock64 and a RPI3) as well as Android TV for Rock64 exhibit the same issue when streaming from RockPro64 OMV.