Mapped drive disconnected

[chairuou]

Anybody got disconnected when copy big file from computer to shared folder ? I've got disconnected when copy files with size from 3GB and bigger. The network setting on TS is no jumbo frame (just default frame size)
 PC and TS  on different swith (TS connected to Cisco Catalyst Express 500G on 1GB port, PC connected to Cisco ESW 520 on 100Mbps port. Two switch connecting together via trunking port.

my TS is TS-RHTGL/R5 F/W 1.35

 

I tried to see the log file of TS but nothing, trying to move another file with 6GB of size on TS itself to see what happen. however, moving file inside it still slow (5MB/s) as Teracopy report.

 

Thank in advance.