I purchased a first gen Zen CPU around when they first came out and noticed a lot of random issues on Linux that often resulted in full system crashes; usually

I purchased a first gen Zen CPU around when they first came out and noticed a lot of random issues on Linux that often resulted in full system crashes; usually due to C-State stuff and other times due to various motherboard firmware issues that only Linux users seemed to experience. They didn't take too long to get fixed but you needed the latest versions of the kernel to keep up with them. However other than those first few months my experiences match yours and I have experienced zero issues. I could see it being possible someone possibly still using an older version of the kernel would still experience these issues, especially if they haven't flashed their bios.