Having problems with computer. I suspect GPU is the problem. Please help.

IHeathIRow

Prominent
May 27, 2017
4
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510
Thank you to anyone taking the time to help me.

Ok so I've been having problems with my computer for the past month now.
Whenever I start my computer up from it being shutdown overnight I will have framerate issues in my game. Once I restart my computer most of the time it fixes it. But even then the game will randomly crash and freeze. Sometimes whole computer freezes.
I didn't start having these problems untill I started play CSGO. But even now it does the same with my other games. I have recently ran msi afterburner and noticed that whenever it freezes my voltage goes down. And the max temp is 86c which I know isn't terrible but isn't good either.
Is my gpu failing or what? I've had it for about 3 years now.

Specs:
I7-4770k
GTX 770
16 gb ram
z97 asus mobo