Matsui LM37NS1 keeps turning itself off?

What can I do? After a short time of being on the green light on the front starts going funny and then it turns off. It will turn back on but does it again and keeps doing it. I have tried the remote its not that, I have isolated it from the sky box, dvd etc and its not that. Is it worth getting repaired, and if so what part do I need and can I do it myself? Is it something thats getting hot after a while? Is it a common fault? When its on the picture is fine, the sound is fine no other problems.