There isn't a phone on the planet that doesn't have at least a few bugs upon its release, but one such bug being reported by some Xperia Z owners is a doozie. The story goes that users are happily using their shiny new phone when it dies and refuses to wake up. Sony has finally chimed in online, saying the issue has been identified and a bug fix will roll out as part of the next software update.
Some folks say a hard restart fixes the issue, having resurrected their handsets multiple times. Other phones seem to be completely inoperable after just a single occurrence.