AFAIK it was fixed and said to be a HW fault that will be covered by warranty repair. Deeper details were not disclosed, but it should be enough to conclude that a) it was HW fault and b) it was fixed in newer revision. My phone was changed in warranty for Sim-card problems and failure in vibration motor and have not encountered HW problems since. Reviews on mobile phones are usually not revised after software updates or HW revisions, maybe with the exception of iPhone.