ASRock AB350M Pro4 - Freezing

This will be long because I want to cover everything so that I can minimize what needs to be confirmed on my problem. So I built my system in november of last year. With the intent of using it for a linux system with a windows VM GPU passthrough R5 1600, 32 gigs of G.Skill 3200mhz cas 16, ASRock AB350M PRO4, MSI RX580-Host, EVGA GTX 1070FTW-Guest I had a ton of issues at first and spent several months trying to figure out what was the issue. I had all sorts of stability problems, I would constantly get black screen crashes (displays would go to sleep with no logs) from seemingly inane things like calling lspci, or certain c-state changes (I think) once it happened if I restarted my system the same kind of crash would happen just before I loaded into the desktop. Here is where it gets strange, I could get that crashing to stop by calling iommu=off (disabling virtualization) and the issues would only happen at all once the system had been running for a little bit, thus why I could turn on the computer with iommu on at all. I later found out that processor had the GCC compile defect and thus replaced it through rma and my replacement 1600 resolved every single bit of stability problems I had.

That was all wrapped up in early february, jump to last month when ryzen 2 launched. I updated my bios, went out and bought a 2700X for the bump in performance and more cores. Everything seemed fine but I was having some stability issues I had messed around with ram and OC and stuff so I initially assumed I had done something wrong, but I kept playing with settings over the next couple of weeks and just couldn't get it to play nice. eventually I reset the bios thinking there was a setting I missed, turned out the thing was unstable at stock too, and then it clicked the only change I had made in the bios was to enable virtualization. And finally I realized I was seeing the same black screen crashes as before, there were just less frequent and harder to cause knowing this I tested kill-ryzen for GCC. It passed naturally but then I tried to get a consistent way to cause the crash once I did I found that it was nearly the same scenario. once it was in the unstable state if I restarted it would crash again before it could get to the desktop, and the moment I disabled iommu in the kernel flags the problems vanished. right now I'm back on my 1600 and have no issues, I've messaged amd support for an rma claim but it's been hard explaining this stuff one email a day and I haven't heard back since last week so idk whats going on

thank you for hearing my super long story if anyone here has any ideas as to what is going on I'd love to hear it