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Unfortunately it sounds like the power button is acting as a momentary contact and not keeping the power on unless you hold in that momentary contact. That means that your interface control board itself is failing. Try to unplug the dryer for 5 minutes to see if the electronics will reset. If that doesn't resolve anything, the interface board will need to be ordered and replaced behind the control panel and that part is about $100. Below is a link to the control board you'll need to order for your model.
CLICK HERE for interface control
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No problem and good luck. Sorry about the bad news but I wish you only the best.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?