Microsoft has rolled out cumulative update KB4077675 for Windows 10 Mobile on February 14, 2018. Here some information about the update, which is only available for version 1709.
Cumulative update KB4077675 for Windows 10 Mobile (Version 1709) contains quality improvements but no new operating system functions. The update includes the improvements of the previous update and addresses the following improvements:
Addresses issue where the touch screen would remain unresponsive. In most cases, using the Power button to turn the screen off and on restores responsiveness. Occasionally, at startup, the touch screen would remain unresponsive, and the only recovery mechanism was to restart the phone.
Update KB4077675 for Windows 10 Mobile changes the OS build to 15254.248. This update will be downloaded and installed automatically from Windows Update.
This update has a know issue: On Windows 10 Phones, PDFs cannot be rendered in Microsoft Edge. Microsoft is working on a resolution and will provide an update in an upcoming release. In the mean time, Microsoft recommends downloading and using the Microsoft Reader app.