After posting my Revision B iPhone X theory a reader suggested looking at manufacturing date information that could help test the theory. My failed iPhone X exchange replacement unit was manufactured in production week 3 (January) of 2018. yuya-310 who has the golden problem free iPhone X told me his was manufactured in production week 15 (April) 2018. His iPhone X is still trouble free and works great.
So we have an initial benchmark to work with: iPhone X production week 15 (April) 2018. If my Revision B iPhone X is correct, iPhone X units produced on or after this benchmark production week should be free of the iPhone X Suica problem.
You can find out your iPhone X manufacture date and factory by entering your serial number here. If iPhone X Suica is your daily transit tool I would appreciate reader feedback (production week, factory code, error/error free unit) via Twitter @Kanjo
日本人のiPhone X Suicaユザーさまもよろしくお願いします。
This could be a fun little research project.
Production Feedback (updated 7-16-2018)
2017 Production week 41 (October) 1 bad unit/factory code (F2)
2017 Production week 42 (October) 2 bad units/factory codes (F1,DN)
2017 Production week 43 (October) 2 bad units/factory code (F2, DN)
2017 Production week 47 (November) 1 good unit/factory code (G6)
2018 Production week 1 (January): 1 bad unit/factory code (?)
2018 Production week 3 (January): 1 bad unit/factory code (F1)
2018 Production week 15 (April): 1 good unit/1 bad unit/factory code (GH)**
2018 Production week 18 (May): 1 good unit/factory code (G6)
2018 Production week 24 (June): 1 good unit/factory code (?)
**The good unit of production week 15 2018 is the yuya-310 iPhone X Revision B theory benchmark
UPDATE: Quick Conclusion here