1) Check the CPU cooler, if its stock,
replace it with an aftermarket cooler. Check CPU temps. A cooler like this may help. And a decent thermal paste too. I use Hardware monitor to check temps. If above 80-90 degrees, you have problems! CPU will throttle and perhaps crash.
My basket at Overclockers UK:
Total: £49.68 (includes shipping: £8.70)
2) Recently, I had issues with RAM causing my games to crash. I used Memtest86 to identify the RAM as faulty, suggest you run the test. If it fails RMA RAM. It caused random crashes when I had the same make of faulty RAM. Corsair what has happened to your quality control!
MemTest86 - Official Site of the x86 and ARM Memory Testing Tool
3) You have not mentioned the RAM speed, is it running with XMP profile with the correct voltage? if above memory errors occur perhaps up the voltage on the RAM check if running at 1.35 volts.
4) Check the GPU for faults, suggest using Furmark to see if onboard memory is faulty. You will be able to run a burn in test with it as well.
FurMark > Home (geeks3d.com)
5) Update the BIOS on your motherboard, this may help with memory and stability issues.
6) Check fan profiles in BIOS, Warzone is a demanding game, suggest you check your fan profiles and increase fan speeds of case fans and CPU fan.
7) If these fail to resolve issue, try a spare power supply and see if you crash still.
8) Also check if the PSU cables are firmly plugged in to CPU socket, 24 pin, and GPU power sockets firmly. System may crash due to lack of juice. That happened to me to with a Corsair RMX 750 watts....Corsair QC...
9) If crashes still proceed replace the graphics card and test another in system. And also check it with MSI Afterburner.
However, my concerns are. You have not mentioned case, number of cooling fans and what CPU cooler you are using. Which is why I suggested the first step. Did you use the stock Intel and thermal paste? You also have to eliminate each part and see where the fault lies.