I def would'nt go for the 'holes' approach - its sealed for a reason - to stop moisture getting In!! i had the same prob with mine and found 1 way to cure it for good. i stuck a small sachet of Silica Gel (the stuff u get with electrical equipment, shoe boxes etc) to the black cover on the inside rear of the housing. Silica gel absorbs moisture and condensation. I have not had it return since!!
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