Hello, I got a Sony Trinitron KV-27S26 and had it for 8 years and the picture looks good until its been on for about 5-10 minutes, then it will shink by half to the top of the screen and have missing about every 3rd horizontal line for about 5 minutes, then after the 5 minutes the whole screen goes black. After the screen goes black I turn it off and turn it back on and it goes though the same cycle. The whole while sound if fine. Is the anything i can do to fix it of should I buy a new TV? Thanks for any infomation

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