The bad news: iOS 11.4.1 does not fix the iPhone X Suica Problem. Given that the problem has being going on since iPhone X day one despite many iOS updates, this is expected and more proof that it’s a hardware issue. Some users tweet that 11.4.1 seems a little better but over time I think it will average out to the same old story.
The good news: another Revision B iPhone X golden unit has appeared after a user exchanged his iPhone X Suica problem unit. @osamumoro’s exchanged iPhone X unit was manufactured on iPhone X 2018 production week 24 (June).
It would be great if the Revision B iPhone X theory turns out to be true so that iPhone X Suica problem units can be reliably swapped out for good ones.