The Surface Book 2 and Surface Book 2 15 may be innovative devices, but they have suffered from two critical problems in recent months. Microsoft now claims to have fixed the NVIDIA dGPU disconnects and BD PROCHOT-related throttling issues that have affected some machines since at least the summer. The fixes should prompt the re-release of Windows 10 version 1903 for the Surface Book 2 series too.
https://www.notebookcheck.net/Microsoft-finally-fixes-the-NVIDIA-dGPU-and-BD-PROCHOT-related-CPU-throttling-issues-that-have-been-affecting-some-Surface-Book-2-devices-for-months.438985.0.html