In the trade we say that the double glazed sealed unit has "Broken down" or "Failed". This means that the perimeter edge seal has lost it’s integrity and that it is letting in moisture somewhere. The moisture itself is hard to spot at first, sometimes becoming only visible as the Sun or another heat source ’draws’ the moisture up. Typically the moisture will be drawn in as the atmospheric pressure changes, and it will build up eventually condensing into water inside the sealed unit. This can sometimes fill to look like a fish tank with several inches of water inside that cannot escape.
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