My Panasonic SC - VK 540 switches off randomly without flashing any error message

Hi All, I have Panasonic SC - VK 540 music system. It has gone to the authorized service station several times for the above mentioned error. But unfortunately they have not bee able to fix the problem. The display does not show any error message before (like F61 etc.)switching of but makes a queer sound similar to a relay toggle. Please Help ! Many thanks in advance Unmesh Deshpande

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