Shifting gears started to feel "sticky" and so I had set up an appointment to have the issue looked at the following week. But while on the highway, and without warning, the clutch failed to catch when trying to change from 5th to 6th gear. I couldn't get the stick into any gear as my car was losing power, and was able to pull off to the shoulder before the issue caused an accident. At least the Hyundai Road Assistance provided a courtesy tow to the dealership.