Last week the HomeKit app on the iOS devices was affected by a bug, which was responsible for giving unauthorised access to others, due to which users were exposed to unsafe circumstances. After this update, the vulnerability is fully patched and remote access for shared users is secure. The updates fix a known remote sharing security vulnerability (CVE-2017-13903) affecting Apple's HomeKit framework for communicating with smart devices in your home.
While the official release notes don't reveal much, iPhone 6S users will be hoping the new update also fixes the battery drain issues many experienced after downloading iOS 11.2. That functionality is now restored with the update.
If your device is eligible to receive the iOS 11.2.2 or tvOS 11.2.1 updates, you can open the Settings, go to the General section, and access the Software Updates entry. Apple has now reportedly fixed the issue with iOS 11.2.1, although the fix has not been mentioned it explicitly in its update log. It's recommended to download the OTA update over Wi-Fi. When getting in touch with Apple Support, the website was told that since Apple Pay is a part of the OS, the only way users can get it back for iMessage is by completely wiping and restoring the device.
When using third-party apps on the iPhone and iPad, some bugs related to reboot have been fixed by Apple in their latest update.