After researching the internet for potential reasons for the dryer problem, I determined that the drum support rollers were most likely the culprit. I then found an online video that showed how to dissemble the dryer in order to access the parts that needed replaced. After disassembly, I discovered that the dryer belt was also frayed. At this point I ordered two support roller assemblies and a dryer belt from Appliance Parts Pro. They arrived the very next day. I installed the new parts and reassembled the dryer. It now runs smoothly and as quiet as the day I bought it 9 years ago.