Microsoft released a minor update to Surface Book yesterday installing a driver update for NVIDIA GeForce GPU. The driver will improve stability for devices that use the graphics card.
Updates for Surface normally install automatically but just in case you need to install it manually, follow these instructions:
Step 1: Go to Start, and select Settings > Update & security > Windows Update.
Step 2: Select Check for updates. If updates are available, they will install automatically.
You may need to restart your Surface after the updates have installed.
As with all updates, not every device will receive the newest release at the same time. For more information about this update or any previous ones, visit the Surface Book Update History page.