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Question: A-s1000 aplifier

My son has purchased A-s1000 six months ago from Italy.Now the amplifier has been using in Sri Lanka since one week when I played the amp about one hour suddenly sound went off and main switch indicator lamp started flashing then I turn off main switch and turn on again amp worked about one minute again started to flash indicator after two days when I turn on the switch of the amplifier started to work tell me what is the reason and how to reset(speaker wires are o.k)