I did the same. I sent it back to Amazon DE. But it's really a shame because it could be the perfect homelab server but CPU issue e random reboot is not something I can live with.
Anyway, I hope to be able to buy a new one really soon.
I also sent mine in DE. I remember you also had the same problem with mce hardware error but you had reboots and all that. That was really a shame. It sounds like we had bad luck. I hope the next revision is better. I think i will wait. Did you send back your ram? The After-Sale Service said they are restocking and expecting it next week. Not sure though is that's already the new revision or not