2001 Kia SportageEX -Scraping sound and a big boom!

I hear a scraping sound on what I think is the right front tire. It seems to be worse after going over a bump. The scraping sound becomes progressively louder and then a big boom is felt as if something were out of alignment and had just shifted back into place.

It’s been to a couple mechanics who didn’t see or feel anything and one replaced the bearings in the wheel but didn’t change a thing.

Any ideas?