Problem with New PC. Random black screen and keyboard and mouse off too

Hello

I just purchased a new PC and Im experiencing a worrying issue. Its happened approx 6 times now in space of 3 days and 5 of those were whilst gaming however Im sure its happened just browsing too. The screen will go black and the mouse and keyboard will switch off as if the whole system has died however the PC unit itself will still be running. It wont come back on unless I hold down the power button and hard reboot the machine.

Ive posted the PC specs below and I "beleive" the drivers are updated. I say believe because the system came with some software called Gigabyte control centre and I installed the AM5 driver update through that along with all other updates it said I needed. I actually think that's when issue started but hadnt really used PC before that so cant be sure.
However I then go to the AMD website and select A620 Drivers and Support and it runs a Win 11 search of my machine I select download of chipset software and it says I need 5 drivers, I install them and restart PC, go to same place, do same thing and it says I need them again and im in a loop where I have logs saying they are installed and yet still says I need. This may be a red herring but PLEEEASE can someone help

MB: AM5 A620
GPU: 4070 Super
RAM: 32GB Corsair Vengence DDR5 6000mhz
CPU: AMD Ryzen 7 7700X 8-Core Processor
PSU: 800w CIT pro 80+ Bronze

Hi

Yes the PC is under warranty and the shop Ive bought it from have been wonderful in trying to help remotely and have offered to look at it if I send it back but I hoped to maybe fix myself and save that. That said, if its the PSU perhaps I should ask for a better PSU and say I'll pay the difference?

Just before I send the shop my request can I just check if the following my evidence anything? I see in Event Viewer a Critical error at the time of last crash and same time as others. It says

Kernel Power Critical Error 41​

However I cannot tell if the crash is generating that OR its being generated because I have to hard reboot the PC when crash occurs (ie I hold down power button so may be a red herring)

I use HWMonitor to monitor my hardware although not sure what Im looking at Do the following voltages look ok?