PC GPU temperature spike issue

[Dato]

So I have really weird GPU temperature spike issue.
 

To start off GPU is EVGA GTX 1080 hybrid, I have dusted my pc and changed thermal paste for GPU.
 

Issue itself: During game play session temperature spikes from 60 degrees to 93 degrees and GPU inbuilt fan speed goes up to 100% roaring like jet.
 

When it happens: this problem happens randomly, what I mean by it is this issue may occur after 2 month or maybe after 2 weeks, but it is not stable issue (My best guess was that when I'm playing games at one point GPU needs to process big data and in that moment heat spikes but it never goes down)
 

After this kind of spike when I turn off the game temperature goes down at slow rate until 50 degrees, but never lower and GPU fan still roars like a beast even though it now works at 60% speed. To drop down temperature what works for me is unplugging GPU and waiting for 5min and then replugging. Then if I turn the same game up or for example FurMark and let it run for 1h or more no spikes anymore.

 

Also one strange case I'll hope that this info will help too, yesterday at night I had this spike again but it was late and unplugging and replugging was a hustle so I turned of PC and went to sleep, in the morning when I turned PC on again GPU fan was still roaring and on idle temperature was still 50 degrees, so I do unplugging/replugging again and it is fixed.

Edit : GPU has water cooling 

[BetteBalterZen]

I've had blowerstyle GPUs in the past. On one of them, I kinda saw the same thing. Even though on the surface the graphics card looked fairly clean in terms of dust, inside the finstack of the blower cooler, bigger chunks of dust was building up. I remove the dust and issue was fixed. Since you have a 1080, you have had a long time for dust to build up inside the blower cooler. Maybe it's worth to have a look inside? 

Edit: 
Just found this: EVGA GTX 1080 FTW Hybrid Tear-Down | GamersNexus - Gaming PC Builds & Hardware Benchmarks

Looks like there's no real finstack but I guess dust still could have build up some places around chips and such but yeah my suggestion is maybe not the issue. Anyhow, I hope someone here can help. 

[Dato]

8 minutes ago, BetteBalterZen said:

I've had blowerstyle GPUs in the past. On one of them, I kinda saw the same thing. Even though on the surface the graphics card looked fairly clean in terms of dust, inside the finstack of the blower cooler, bigger chunks of dust was building up. I remove the dust and issue was fixed. Since you have a 1080, you have had a long time for dust to build up inside the blower cooler. Maybe it's worth to have a look inside? 

I have opened it and removed  all dust but this still happens occasionally and only way to fix for me right now is to unplug/plug GPU then issue goes away