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Well on the ones that clear half way normally it is those thin painted on like grid that gets scratched from cleaning and the loop gets broken. Where ever the frost line doesnt clear start checking those lines for a break, normally a scratch in it. At a good automotive parts store you can get a tape or a paste to fix it. Normally the paint on paste works well but remember to tap of the area so you keep the same little line. If your getting power to the grid then it normally will be a problem like this. Its surprising that these will peel and just from cleaning the window this will happen also.
Good Luck
P.S. The other issues sound right about overheating in the module and plug mealting another idea might be checking for lose ground. just a thought..
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