Hi Gary, it sounds like heat may be the issue. You might want to check your oven temperature by purchasing an inexpensive oven thermometer. Preheat the oven for a full 30 minutes and then check the thermometer reading. If your oven is running hot, it's easy enough to adjust the oven setting and wait for the thermometer to show the correct baking temperature. Another option would be to try using cake strips to moderate the temperature of the sides of the pan. 

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