AMD has confirmed that some users of the AMD Adrenaline GPU drivers are experiencing automatic CPU overclocking of their Ryzen processors. Talking to Tom's Hardware, the company remarked, "We are investigating the issue and we'll share more information as soon as we're able."
https://www.notebookcheck.net/AMD-confirms-that-the-Adrenaline-GPU-drivers-are-overlocking-Ryzen-CPUs-without-user-consent.612256.0.html