My TV is 4 years old and working brilliantly up to now. Recently notice that when we turn it on, the picture on the left of the screen, about 4 inches wide is missing. This lasts for about 10 minutes and then reverts to full screen again. If I change the picture size to 4:3 during this 10 minute period, I can see the picture fine.
Is this something I can fix myself, or would it need to be sent away? Is it likely to get worse?

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