I have a LER7646AN0 Whirlpool Dryer. Just recently, it started making a "whining" type of noise. Now, the clothes arn't drying completely. A couple of times I had to actually stop, turn the drum and then restart. I went out today to check to see if the vent was clear, and it was blowing warm air, so that is clear, then I went in and it had shut off, on its own, but time was still left. I had to wait a bit for it to restart. Plus, there is a burning smell in the laundry room. Any thoughts what my problem is?