It seems that I've tried everything with this game, besides replacing hardware. This issue occurs ONLY in GW2, and no other games. First, the hardware:
GPU: AMD Radeon HD 7700 Series PCIe 3.0
CPU: Intel i5-4570 @ 3.20 GHz
PSU: Dynex 520W
Motherboard: BIOSTAR Hi-Fi Z87X 3D
OS: Windows 8.1 Pro 64-Bit (upgrade from 8)
Not sure if anything else is needed.
Basically, I start up GW2, and between 5 min. to ~3 hours, the video card will stop sending a signal to my dual monitors. The only solution I've found is to do a hard reset of the entire computer. The fan still runs, and sound can still be heard, but no signal is being sent. I've checked all cables, and tried every driver from the first 12.X driver, to the latest 14.4 driver available. The GPU and CPU temps rarely go over 50C. I've fooled with the power options in the control panel, but no luck.
However, this error hasn't always occured. I first found out about it on Windows 8 64-bit, when I upgraded to the 13.X series of drivers. Eventually, I did I clean install and reverted back to the 12.10 drivers, and had no problems whatsoever for over a year. After recently upgrading to Windows 8.1, it seems the error occurs with any driver set, and multiple users have the same problem with the 7770 card. I'm not tech savvy enough to fix the problem myself, hence why I'm asking here. If any advice or info can be given, please feel free! Thanks.