We had a similar LG model that started doing that. I watched a YouTube video and figured out it had to be bearings. Ordered bearings and watched the video again to take it apart. The bearings were only about $20 and despite having to tear the thing all the way down, were pretty easy to get to. Turned out it was the die cast aluminum spider piece that the shaft was mounted to had broken. If I had tried the repair soon after the noise had manifested itself, I probably could have gotten away with bearings. The spider piece, if I remember correctly was about $150. At that point, my wife said the heck with it, let’s get a new set. Moral of the story is don’t wait until those squealing metal on metal sounds get worse. Anyway, given what I know, I’d at least tear it down to inspect the spider shaft piece. If it’s intact, you should be good with $20 in parts.