FWIW I am running a two week old Ryzen 5 2400G and ASRock Fatal1ty X370 Gaming-ITX/ac setup with rock solid stability under Windows 10. I did end up having to run my 3200MHz memory at 2933Mhz to avoid some issues. This is the max memory speed the CPU supports anyways so I don't consider it a large loss. The ASRock published memory QVL agrees with my finding that 3200MHz isn't stable with the specific memory I'm using. See https://www.asrock.com/MB/AMD/Fatal1ty%20X370%20Gaming-ITXac...
What ASRock model are you using? Are you sure the culprit is the CPU or motherboard and not another component?