Regal Kitchen Pro K6776 Bake Cycle timer not working?

Regal Kitchen Pro K6776 bake cycle is supposed to be 50 minutes, but mine automatically stops and ends the process after only 27 minutes and 30 seconds, leaving it not fully baked through and doughy inside. I have to remove the unbaked loaf and finish baking in oven for approx. 30 more minutes at 350 F. Is there a simple way of reprogramming or replacing the microcontroller to fix?