Dryer will heat up and run, and air does blow out of vent for a few minutes, then will stop heating up and continues to run for entire cycle +. I have opened the vent up in the basement and find that there is no air blowing out of dryer after a few minutes either. Problem has increased over time from taiking to long to dry to now not drying at all. Sensor doesn't seem to work now either. Has this happened to anyone else? What can I do to repair problem?.