Well, it's more that it shouldn't have been derailed into the Mini at large... but people are trying to help you make the best of your money, as the best chance of a 4-year upgrade to the Mini is within two weeks.
As for your Mini, best bet is 10.13 High Sierra in my opinion. You might be able to get El Capitan (10.11) on there, which is 2015, and runs better on hard drives, whereas newer ones tend to be optimized for SSDs.
I understand that and appreciate greatly but the title is misleading i didn't know it wasn't actually a 2018 Mini.
Gary
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Do you think anything could be done software-wise to fix it? Not sure what I will be doing when I buy a new Mac but if I sell it and could fix this for someone before I switch to the new one that would be good.
Keep in mind I'm just guessing based on long history with Computers. If the Cache is not working nothing can be done the CPU is defective.
Gary