Question Computer turns off and I need to flip PSU switch off and on to launch it

[nufrit.488]

Hello everyone,
I'm running into a problem for the last week. Sometimes if I am playing games GPU bound, after a while my GPU hits the temp limit my PC shuts off. And I need to reset PSU to restart my computer otherwise pressing power button won't work too.

When I go to Event Viewer on windows it just says kernel error 043, system shutdown was unexpected.
If I'm using my PC for light work it is totally fine. Playing LoL, CS:GO, Minecraft didn't make any problem too. I've faced this on Warframe. I've tried to turn off every graphic setting to lowest possible but it didn't help.
I'm thinking that it might be my GPU doing it but after a research most of the people says PSU might be putting itself to safety mode to avoid any shorts.
CPU temperatures are all good, 78C at max. But my GPU temps are 83C on core, sometimes it ramps up to 3300-3400 RPM. HotSpot temperature is 104C.

Anyone might be able to help? Do I need to replace my PSU or maybe cleaning out my GPU would be just fine? Do I need to replace my GPU's thermal pads too?
I've got this PSU for around 2yrs now.
Edit: I've tried to undevolt my GPU to 0.9mV this did not solve out the problem too.

MY System specs are:
R5 5600X (No overclock)
RTX 3080Ti Ventus 3X
Corsair RM 850x -850W 80+ Gold
16GB 3200MhZ DDR4 Ram
3440x1440 Monitor

If anyone is suspicious for the PSU workload;
Couple of Hard Disks and SSD's and total of 6 Case fans.

Thank you!

 

[Lutfij]

You might want to source a donor PSU(borrowed, not bought) reliably built unit with slightly more wattage than what you have and see if the issue persists. As for your build, what is the make and model of your case, the fans, the number of fans and the orientation of asked fans?

Ambient room air temps?

 

[nufrit.488]

You might want to source a donor PSU(borrowed, not bought) reliably built unit with slightly more wattage than what you have and see if the issue persists. As for your build, what is the make and model of your case, the fans, the number of fans and the orientation of asked fans?

Ambient room air temps?

Hmm I might have to try PSU advice.

My Case is MSI MAG FORGE 100R, I've got 3x ID cooling case fans in it, Two of them are pre-installed MSI case fans, One exhaust from MSI pre-installed again.

Three intake and Three exhaust, 3 on front are intake 2 on top and one rear is exhaust
Room temp is dependant on the time of the day but it is between 25C to 32C I can say, yep im living in a hot place...