Been having problems with frost buildup in my LG LFX31945ST (02) French door with bottom freezer fridge. At first thought it was a faulty gasket but then noticed freezer drawer was not closing evenly. Looked for something that might have fallen off freezer tray and was causing a blockage. Finally noticed at the top, back of the freezer a large chuck of ice had accumulated. Knocked it off, it was 8 X 4 X 4. Drawer now closes evenly and gasket seems tight all around.
Don’t know how it accumulated but will now put that on my every couple of months check list.
Finding that chunk saved a good cost for a new gasket.