A few more details about this issue...
1) I removed all the NFS mounts and got the same issues with just Samba
2) I also noticed that the server web interface does not come up when using my 10Gb desktop machine, if stays loading forever, I can do the login authentication but never seem to be able to get anything from nginx. But the web UI works fine over WiFi or even on my gigabit network
3) I do have a Chelsio S310E-CR 10Gb card on my unraid server. The server also includes 4 x Gigabit cards, they are all grouped on the same interface (so, 10Gb + 4x1Gb on the same group)
4) unraid 6.5.3 works fine. but 6.6.x goes nuts, and I tried all versions, 6.6.0, 6.6.1, 6.6.2 and 6.6.3, they all behave the same
So, I was incorrectly blamming NFS, but the problem seems to be 10G networking in general and not NFS or Samba. So, maybe the Chelsio card is the problem? Anyone has any issues with the Chelsio 10Gb cards and unraid 6.6.x?
Thanks,
Jorge