The control panel on our whirlpool electric range keeps acting strange. When we use the oven for baking, after we are finished cooking and hit the cancel button to cut off the oven, the clock time will now be off by several hours (this does not happen every time, but more than 50% of the time). Often, when we hit the bake button to set the oven temperature, the entire control panel goes black, and then when we hit the cancel button we get a "30" displayed on the screen. Sometimes the panel stays black and we have to go out to the breaker panel to reset the power to the range. The computerized control panel part number 8507P240-60 has already been replaced 3 times, but we still end up with the same results.