Frigidaire dryer noise

My dryer has started making a scraping noise from time to time. The noise usually doesn’t start until its been running for 15 - 30 minutes. About a year ago, I was getting a high pitch sound and replaced the bearing. I just don’t know if the scraping sound could be the bearing again (maybe needs more grease) or if its something else like the glides being worn. Any ideas? Thanks in advance.