RTX 3070 Asus ROG Strix issue

[ImOak]

Hey guys, after many years with an older PC I decided to build a high end PC for gaming/streaming and work. Build is as follows:

Motherboard: Asus TUF B360M-E GAMING
Processor: Intel Core i9-9900K 3.6Ghz, 16MB LGA 1151

RAM: Goodram 32GB DDR4 2666MHz CL19 DIMM (2 x 16GB)

SSD: Kingston 1000GB SSDNow A2000 M.2 2280

GPU: Asus ROG-STRIX-RTX3070-O8G-GAMING

PSU: NOX HUMMER X Series MODULAR ATX PSU 750W 80+ GOLD

Case: MSI MAG FORGE 100R
WaterCooler: MSI CoreLiquid 240R

OS: Windows 10 64x

 

THE ISSUES

So, when my build came it worked fine for about a week, but then my graphics card started crashing. I managed to recreate the crash in 3 ways:
- Playing any medium to high end game. Sometimes it crashes 1 minute into the game , sometimes it takes about 15 minutes, but it always ends up crashing.

- Banging/punching my desk caused crash;

-Banging/punching my case caused crash; (controlled punching holding the case so only the components inside would move, not rage punching)

 

------How the crash manifests--------
When the crash happens my 2 monitors shut off for a sencond, then turn on with random colored bars or squares, then shut off again for a second and turn on (apparently) fine, but any game I was playing presents a graphic lost connection error.

------- TRYING TO FIX THE ISSUES------------

So I brought my computer to the store I bought it (friend's store, so they let me help/ be there while they tried to fix it) before activating the warranty in case the problem was a connection issue (thought it might be because of the desk punching crash).

----- Fixing attempts--------

1- Removing and putting the GPU back into the motherboard slots ==== FAIL

2- Got a GPU support ( NOX Hummer H-VGA Support) because the graphics card is heavy and big and was tilting slightly ===== FAIL
3- Makeshift side support (will be replaced by a proper one) between the side of the case and the GPU === Seemed to fix it but it ended up FAILING ultimately.

---- FUTURE TRIES----
Will try to DDU it.

--------- END ----------------------

Does any computer expert know what could be causing the issue/ any attempts I should make to try and fix it? I would like to avoid RMAing it but if it's faulty GPU I have no choice.

Thanks for any replies and sorry for the long post.

[ki8aras]

given that physical shocks end up in a crash, ill chalk it up to a bad connection, maybe there could be dust in your pcie slot or you just didnt install it properly

[frozensun]

Never heard of such PSU.

I'd rather be suspicious about it then GPU.