Hi Drashna,
I rebooted the server today after work, and guess the issue is gone! Not sure why now the issue resolve it self, and yesterday not. Maybe you can explain.
Thanks for your input! You also helped me a couple of times on the We Got Served Forums. I'm a old Windows Home Server beta tester, but got disapoined in Microsoft after killing WHS and the release of Windows 8. I'm considering coming back to Windows after several Linux years. I have now a install of Windows 10 on a server. I think Stablebit is a interesting solution for SMR drives. I have 7 Seagate Archive drives. Also considering to try a server version of Windows, but the biggest issue I find it a bit expensive.