SMB Errors/Network seems to drop out during transfer - Error Network Error 0x8007003B

Hi,

I am struggling to figure out whether the error above, which I'm seeing from two different cabled Windows clients, is being caused by something I've done wrong when setting up my FreeNas system

• HP Proliant ML10 Gen9
• Intel Pentium G4400 CPU
• 32GB ECC RAM (Crucial)
• 4x WD Red 6TB Drives in Raidz
• Network card identified as Intel i219 (built-in NIC)

I have set this up with DeDupelication on some datasets so am expecting to need to add more RAM, but I've not been...

SMB Errors/Network seems to drop out during transfer - Error Network Error 0x8007003B