GPU Problem

Hey everyone!
I've had a problem that i'm quite sure is the GPU itself, and 'im undecided whether it's the fans causing trouble or not.
I have 3 fans on my GPU , and the ones on the right and the left do seem to be slower. Plus they make some sort of flickering noise at around 50% fan speed.
I have this problem while playing video games. After at least ten minutes these huge black lines start appear all over my screen.
My GPU isn't overclocked so that isn't the problem..
So my question is is there any way to fix this? Is it just my GPU dying (brand new , had it for at least 2 years) or can I somehow manage to make it stay alive?
In the link down blow you're able to see the problem in Overwatch , playing on high setting, which my computer should be able to handle even higher qualities. (Happens almost on every game , Dark souls 3, Dark Souls 2 , etc etc.)
https://sendvid.com/oxypx9pk
Comments and any sort of help will be immensely appreciated ,
Roy.
EDIT:
In addition it's not my HDMI cable or anything .I have a R9 280X Battlefield 4 edition with 3 fans.

vger said:

Hello

Also 80 c is a little high.. Does the Gpu-Z pull up the other fans?

Click to expand...

Hello and thanks for the reply.
My card is a gigabyte windforce r9 280x.
Recently, I discovered that 100% the fans in the gpu itself are causing the noise/rattling.
I'm thinking of lubing them, but when I take the sticker off its sealed with some sort of plastic cap.
I think it goes like this;
Fans on the sides of gpu aren't lubed--> fans are slower--> increased temperatures after a certain amount of time --> gpu fails
Though , I wonder if 2 fans that aren't working properly can lead to this sort of graphical errors+ im uncertain how to lube the fans (plastic cap seals it, and i cant open it)