check over at avsforum.com for a definative answer, but IIRC, that was "urban legend" along the same lines as "they need to be recharged with gas" after X years.
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I recalling hearing about this issue a few years ago. A quick Google search yielded many pages of links to websites discussing the issue. I typed this into Google "Plasma TV Altitude problems". Here's a link to the search and a sample: