One possible fix that works for frozen iphone 8 home screen is to hard reset the device
- Force Restart on iPhone 8 (steps are different from previous models):
- Quick-press the Volume Up button.
- Quick-press the Volume Down button.
- Press and hold the Side button for ten seconds, until the Apple logo appears
Please keep updating your iphone to latest iOS version available as this issue of iphone freezing in iOS 11 update seems to be fixed in iOS 11.1 release.