Apple today released iOS 11.2.1 as a free software upgrade for all iOS users. In the software, the company addresses a bug where some users had experience unauthorized HomeKit access to some devices. The issue was avoided by disabling HomeKit control for shared users, and now the bug is entirely resolved.
iOS 11.2.1 fixes bugs including an issue that could disable remote access to shared users of the Home app.
To install the new update on your device, head over to Settings > General > Software Update. Tap “Download and install” next to the iOS 11.2.1 listing and you’ll be good to go. I recommend jumping on a Wi-Fi network first alongside plugging in your device beforehand as a) you don’t want data overcharges on your bill and b) you don’t want your phone or tablet to die during the installation process.
Just last Saturday, Apple had seeded iOS 11.2 which included a strange bug that would cause devices to crash at a certain time of day alongside Apple Pay Cash.