Apple has released iOS 11.1.2, which addresses an issue in which some iPhone X models became unresponsive in cold weather. The update also:
° Fixes an issue where the iPhone X screen becomes temporarily unresponsive to touch after a rapid temperature drop
° Addresses an issue that could cause distortion in Live Photos and videos captured with iPhone X
The iOS 11.1.2 update can be downloaded for free on all eligible devices over-the-air in the Settings app. Go to Settings –> General –> Software Update.