strange network disconnect issue

Hello friends,

I have a FreeNAS with Intel Pro 1000 MT running samba. When transferring large files (100mb-50gb+), it is working fine. When transferring a bunch of smaller files (jpgs, docs, etc), the server NIC would disconnect and stop to respond to ping from another machine within a few minutes of the transfer. At the meanwhile, checking from the FreeNAS shell, pinging itself looks ordinary. Have anyone seen anything like this before? Thank you
The attachment is a wireshark capture when the network disconnects.
 

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