Thanks for contacting manage my life about your dryer model LGR5636LQ; sorry you are having a problem, I will be glad to assist you. Based on the description you have provided it sound like the may be an air flow issue. If the dryer cannot move air through the system and out of the venting the flame will act just as you described. My recommendation would be to test the venting system. Access behind the dryer and remove the vent hose from the dryer, place it away for the vent outlet of the dryer so it does not restrict air flow. Set dryer on a high heat and run a cycle, observe the flame (as possible) if the dryer heats properly with the vent hose disconnected then the dryer is okay but you venting to outside the home is the issue and will need to be cleaned. If this test does not allow the dryer to heat properly then you should test the power to the burner assembly after it goes off. If there is 110 volts ac to the burner assembly and no ignition then the flame sensor or the igniter will be the cause. If there is not power to the burner assembly then the heat circuit need to be tested, thermostats, high and cycling. I have attached images below to help you check the components, I hope this helps, if you need more help reply with added details and I will be happy to respond. If you get to the point where you need to have a service technician diagnose and repair this failure, you can schedule service through this link: Sears Home Services.If you need parts help here is a link to Sears Parts Direct. Ron H.