Those are priors such as https://www.google.com/search?q=980+video+shut+down+randomly&ie=utf-8&oe=utf-8 so test the rig without that.
And as usual be sure the BIOS is current.
My computer which I put together a year or so ago has a bad habit of shutting down randomly. It can shut down when just sitting idle on the desktop or during a flight sim.
I have checked the temps of the processor, MOBO, video card and all seems OK even immediately after a shutdown.
I check the event viewer logs and see an ID 41 which to me seems to point to a possible bad power supply which was new along with the computer.
So I am wondering if I need a bigger power supply. I have also noticed my PSU fan briefly starts on startup and then stops which I think is normal for the type of PSU I have. (Corsair HX750i)
Any help will be greatly appreciated
Here are my system specs:
Mainboard: ASUSTeK COMPUTER INC. MAXIMUS VII HERO
Chipset: Intel Haswell
Processor: Intel Core i7 @ 4000 MHz
Physical Memory: 16384 MB (2 x 8192 DDR3-SDRAM)
Video Card: NVIDIA GeForce GTX 980
Hard Disk: Samsung SSD 850 EVO 1TB SCSI Disk Device (1000GB)
Hard Disk: Samsung SSD 850 PRO 512G SCSI Disk Device (512GB)
Hard Disk: Western Digital WD20EARS-00MVWB0 SCSI Disk Device (2000GB)
Hard Disk: Seagate FreeAgent (1000GB)
DVD-Rom Drive: Toshiba-Samsung CDDVDW SH-S203N
Monitor Type: Asus ROG PG278Q - 27 inches
Network Card: Intel Ethernet Connection (2) I218-V
Operating System: Windows 7 Home Premium Home Edition Media Center 6.01.7601 Service Pack 1 (64-bit)
DirectX: Version 11.00
Windows Performance Index: 7.7 on 7.9
Power Supply Corsair HX750i
Voltage VID: 1.282 V (from PC Wizard)
I can send my DXDIAG if needed