The TV has an internal component fault and may be switching itself off to prevent further damage.
There is no DIY remedy for this: if it's still under warranty then get it repaired, if the warranty has expired then you'll need to take it to a repair shop of your choice. The good news is that most repairs are relatively simple and are highly cost-effective, the bad news is that you sometimes have to wait a long while if an entire circuit board needs to be ordered from the manufacturer.
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The TV has an internal component fault and may be switching itself off to prevent further damage.
There is no DIY remedy for this: if it's still under warranty then get it repaired, if the warranty has expired then you'll need to take it to a repair shop of your choice. The good news is that most repairs are relatively simple and are highly cost-effective, the bad news is that you sometimes have to wait a long while if an entire circuit board needs to be ordered from the manufacturer.