TV that heats up and displays a black screen...

Hello,

I'm reaching out to you because I'm having a problem with my TV, it's a Samsung flat screen. When I turn on my television, once it gets a bit warm, the screen goes black; it turns off, but the sound is still audible, there's just no picture. Sometimes, just turning it off and on again makes it work, but five minutes later it turns off again, which is quite frustrating over time... Do you have any ideas? :S

Thank you for your responses :)