Hi, i have a 2012 Kia Sorento. The last 2 days there has been a very loud, very intermitent metal sound coming from around the drivers front wheel. It almost sounds like cans being dragged along the road. Sometimes at 10mph, sometimes at 40mph. Stays for about 5 seconds or less. Brakes and rotors look clean and have lots of life left in them. We went up a logging road at the weekend. Could something have got into the bearings? But wouldn't the scraping noise be all the time if it was? HELP please! Any feedback hugely appreciated.