tibiano1j, your temperatures look fine. Ryzen Master is the reference for temperatures. Always use it to verify any other applications. Above is the Specifications for your processor. I had a similar problem on my 1800X and it turned out to be bad memory slots that required an RMA. Please plug one stick into A1 and run awhile. Move it to A2, B1, then B2. If no failures try the other stick. Hopefully this will identify a bad stick or a bad slot. Then you either RMA the memory or the board. Please let us hear how it comes out. Hope it helps, enjoy, John.