File transfer error and network connection lost.

[jcgechevarria]

Greetings to all, to see if someone can help me or can know the cause:

I have two machines with DSM 7.1.1 sp 5, when I want to transfer the information from one to the other, 1 TB in photos and 1 TB in music, I find that the destination machine, after a while, disappears from the network and I receive a file cannot be copied error, the destination machine is not visible in windows explorer, nor is it seen by synology assistant, but the nic has a link, but the sending machine remains accessible, I have tried with 3 intel ethernet cards and two switches, if I transfer the information in small batches I do not detect the incident, but if I copy each folder at once, that is, the entire music folder, then I encounter the problem, at different times, it is not that it happens after 15 minutes or 400 GB ... but it happens ... any ideas?