Before you start replacing anything considers a few things...
1. Is Linux unstable as well? Crashing, freezing, running slower than normal
2. Are your other games having issues in Wine/Proton as well?
3. Run MemTest from a flash drive to test the RAM. Most Distros have it built-into the image you install from a flash drive.
I've rarely had a motherboard or CPU die on me. Even a faulty power supply can cause issues. Memory is likely the problem or the hard drive. Are you using Solid State Drive or Hard Drive (spindle)?
I know you did a fresh install, so if you are experiencing the same issues it could be the hardware.
Also be sure you have all the dependencies installed too:
- All Distro Updates
- 32-bit Libraries (ia32-libs-multiarch)
- Install a stable Nvidia driver
- Install older Nvidia driver to test
- Install Vulkan drivers (should come with Nvidia at this point)