AC87U Fiile transfer issue

Hi again,

I have AC87U with 56_2 with dlna, samba , and ftp on.. also i'm using OpenVPN server.

I have problem when i try to copy some file from attached HDD through PC to external HDD.

HDD is EXT3 formatted and also has external power supply , it's 2 TB.

It's starts but after a few seconds all system crash. I lost internet connection , stop to transfer file and before roter's WAN i have switch for IPTV and my tv also lost connection but it's connected to diffrent vlan.

Is anyone has...

AC87U Fiile transfer issue