I have a Zo machine that's about 4 years old. The window at the top isn't insulated glass and allows a lot of the heat out while baking. As a result, most of my loaves come out fine on the sides, but very light on the top! I've tried putting aluminum foil inside while baking and covering the window with hot pads & towels to reflect the heat back in. It helps but not much. Any ideas what I can do to resolve this? Because other than that, it's a great little machine and I love is convenience!

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