Our Sanyo TV is approximately 12-15 years old. For the past few weeks we have noticed on three different channels a black rectangular box that appears near the lower half of the screen. Takes up about 1/4 of the screen. When this happens the color dulls on the screen (background, people, objects etc) almost looks close to black and white. When we change the channel and then go back to the 'problem' channel, it looks normal but within a few seconds back to the same problem. This doesn't occur all day. For example we will watch a program mid afternoon, the problem appears for a few hours but later in the evening on the same channels everything looks normal. It seems to be off and on. We thought maybe there was a problem with the tv stations but we checked our other tv and there are no problems with it. Is the TV starting to wear out? Anything we can do to fix it?
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