We had our winter tires swapped for summer tires at the Discount Tire on 361 S Grady Way, Renton, WA. After driving on them for over a week’including high-speed highway driving’our car suddenly started feeling like it had a flat tire. However, the tire pressure was completely normal. Upon closer inspection, I noticed the rear passenger-side tire was sitting at an angle. When I removed the hubcap, I discovered that one lug nut had completely fallen off, and the remaining ones were all loose. It appears that the Discount Tire technician only hand-tightened the lug nuts during installation.