Question about Panasonic TH-42PD50U 42 in. Plasma EDTV

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Viera 50 i have got a panasonic viera 50" tv. we where watching it and it just whitched its self on to stand by, but the red stand by light is flashing. if we turn the tv off and switch it back on it will be alright for ten minutes or longer and then go onto stand by again.some times it will try to come on but just go to stand by mode. please help. yours truly ian berry

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