hear clicking sound before off

Good Day I went to my friend he ask for my help if i can repair his kenwood model RX-39 audio system. I turn on the power then it seems the unit have no problem but after 3 seconds the unit turn off and the message appear on the display ( Protect )..I noticed after repeatedly turn on i hear a clicking sound inside the unit before the unit turn off..I plan to open it by next week so that i can first gather informations before i try to repair it. By the way... My friend told me that sometimes he can used the unit for a couple of months when he will not used the unit for a weeks then after the unit will fail again then he will not used the unit for a weeks..... it seems that the unit is working if had taken a rest.

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