Windows 7 - Freezing/shutdown problem when transfer files

Hello. My HTPC has a 2 TB drive for backing up media from my main computer. Whenever i begin copying data from the main computer over the home network onto the 2TB drive, about 5-15 mins later, the computer freezes for about 20 seconds and then turns off.

The problem is not heat/ventilation related, and i have tried two different PSUs and various ram configurations. This does NOT happen when the HTPC is in safe mode, and i currently have a fresh virgin installation of windows with only the motherboard drivers installed. Both PCs are running Windows 7 64 Home premium.


Please help i am so bewildered.


Thanks

-Mike


rig:

GIGABYTE GA-H55N-USB3 LGA 1156 Intel H55 HDMI USB 3.0 Mini ITX Intel Motherboard

G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ

Intel Core i3-550 Clarkdale 3.2GHz LGA 1156 73W Dual-Core Desktop Processor BX80616I3550

Crucial RealSSD C300 CTFDDAC064MAG-1G1 2.5" 64GB SATA III MLC Internal Solid State Drive (SSD)

APEX MI-008 Black Steel Mini-ITX Tower Computer Case 250W Power Supply

What NAS are you using? What router do you have? Are you doing this over a wired or wireless network?

No nas, just a 2TB drive connected to the HTPC and a

D-Link DGL-4100 10/100/1000Mbps GamerLounge Broadband Gigabit Gaming Router

conecting both computers. I am just sharing the files with windows.

Which computer freezes and shuts down? Have you checked the system logs to see what happened?

The computer that frrezes and shuts down is the HTPC which is writing files to a 2TB drive that i planned to use only as back up. The files are coming the shared folders from my main pc.

I have looked at the event logs but im afraid i can't make heads nor tails of it. If you could intruct me what to look for i would be more than happy to..


Thanks


-Mike

OK strange little twist, the computer also randomly turns off by itself when i am not transferring files over the network. However i can't seem to pin point what triggers it. It will ALWAYS shut down after a few mins (5-15) of transferring a file over the network. I ran prime95 for two hours today and that had no ill effect..... I am really pulling my hair out with this.



-Mike