If you have purchased the latest Surface Pro and are having problems where the tablet just shuts down, you are not alone. Many users are reporting issues where the tablet just shuts off/hibernates. As of yet there are no official fixes or work arounds. The last Surface Pro models also had power management issues that plagued it from the first several months of it’s life on the market there were eventually fixed with updates. It’s unfortunate that its successor may be suffering similar issues.

Source: Thurrott.com

Update 7/13: Microsoft says they have identified the issue and are testing a fix that will be released as an update.