REPRODUCIBILITY (% or how often): 100%  BUILD ID = OS VERSION (Settings > About product): 4.0.1.48  HARDWARE (XA2, Xperia 10…): Xperia 10 Plus Dual Sim  UI LANGUAGE: Russian  REGRESSION: (compared to previous public release: Yes, No, ?): Yes  DESCRIPTION: Every time I plug in my phone to electric power, few minutes later I head a strange sound, like a little gong ringing single time. The delay between plugging in to power socket and this sound can be different. Sometimes in happens almost immedi...