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I've a had a similar problem when I got drench in the rain... the Z3C phone was in the my pocket the whole time but 2 hours later... the phone just gave up the ghost with moisture in the lense. So much for a water proof phone...
....also not impressed by Sony's online repair system. Submitted a fix request form online ... no further information on where to send the phone and no other details - just got a response a month back saying it was closed...
A pointless exercise.
.... reluctantly looking towards an Apple iPhone next time... at least their promises are not advertised as being complete ...