It will be the control board (#12 on the look up). Make sure the wire is not off that grounds the one side of the sensor bars inside. Also make sure the both are tight on the back of the sensor bars. Also check that you have a clean vent all the way through the house.
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I do not do hvac. You can look me up at any time and let me know your question. You do not have to accept right away. $14 is a good starting price for most questions. If it is an involved repair you can give a bonus. The more information you can give me on your first question the better.(model and serial #'s noises, smell, error codes, repair history)
As far as the dryer you have changed every thing else on what would deal with the auto cycle. Leave this question open and let me know what you find. Also if you own this many units find a parts store that will give you some kind of discount. I will send you OEM #'s so you can check for price and get the parts locally. Board part#134216300
Let me know if you need anything else.