My 13900k has definitely degraded over time. I was running bus defaults for everything and the pc was fine for several months. When I started getting crashes it took me a long time to diagnose it as a CPU problem. Changing the mobo vdroop setting made the problem go away for a while, but it came back. I then got it stable again by dropping the core multipliers down to 54x, but then a couple months later I had to drop to 53x. I just got an rma replacement and it had made it 12 hours without issue.
