The dryer has stopped heating three times in the past two months. Always clean the filter after every load. Each time the dryer has stopped heating, we have cleaned the dryer from all lint using a vacuum and have also cleaned the duct and have pushed the re-set button. It works, until of course it stops heating again. Thought we just needed to replace the re-set button because the heating element heats up again, but don't know for sure. HELP?