The iOS 12.1 update is a major milestone upgrade for the iPhone 7 and iPhone 7 Plus and it could have a noticeable impact on your device’s performance.

Apple’s new version of iOS 12 comes with a nice list of new features, important bug fixes, and security patches. The update is performing well on our iPhone 7 models in the early going, but it’s far from perfect.

iPhone 7 users are complaining about a variety of iOS 12.1 problems including weird battery drain, Bluetooth issues, Wi-Fi problems, and issues with first and third-party applications.
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https://www.gottabemobile.com/7-things-to-know-about-the-iphone-7-ios-12-update/