I am never going to use a silicone bunt baking pan again. I had been using one for a few years and I had also been having some trouble with my cakes not baking properly. Resulting in cakes which were overcooked and burnt on top and pretty much raw in the middle. Not pretty and I hate it when my baking fails.
So I thought about it and I realized that a bunt pan is a special pan because of the tube in the middle that will radiate heat through the middle of the cake, ensuring a more even baking for the entire cake. However with a silicone pan, there is no heat radiation like there is in a metal pan because Silicone is an insulating material. Also the heavier a pan is, the more evenly it radiates heat. Silicone is super lightweight which means it will react to heat fluctuations in the oven much more quickly. Which will affect how the cake bakes.
So don't bother getting a silicone bunt pan to bake with. You will regret it. Get a solid, heavy, non-stick metal pan instead.
However my six cup silicone muffin pan works great, and it is extra deep resulting in big fluffy muffins. I also enjoy the silicone baking mat I have for putting under cookies and things, and the bread pan also works well for me. The only one I have had consistent problems with is the bunt pan. Strange.
Miss Busy Bee