If you've been running the latest Windows 10 Insider build on your Surface Pro 4 or Surface Book, then you might have been experiencing some issues with Windows Hello. (Author's note: My Surface Pro 4 was having so many issues with build 14342 that I factory restored back to production. Windows Hello was one of the main issues.) Microsoft seems to be aware of this, as a tipster over at Windows Central has indicated.
Specifically, if you're running either of the latest Surface machines on the latest Windows 10 Insider builds, then you should be receiving a new driver update that seems to help alleviate issues with resuming the machines from sleep. One of the most visible issue that the driver hopefully resolves involves Windows Hello.
Windows Central has confirmed that the Intel CSI2 Host Controller driver update does seem to help with Windows Hello performance, at the very least. We can also hope that the new driver will help the machines resume from sleep more reliably in general.
If you're running a Surface Pro 4 or Surface Book on Windows 10 Insider, then go hit that update button. Let us know in the comments if the new driver helps make your shiny Microsoft flagship 2-in-1 more reliable.