Rear Signal and Tail Lights frequently become loose in the lamp sockets and will not function. Usually need to remove the light fixture holding the Signal Light and re-set the bulb in the socket, this may take more than one attempt for the bulb, lamp to properly function again. Reported once to Hyundai Dealer during recent service at about 56,500 miles, a week later same problem and this has been happening well before this with about 34,000 miles. Same for tail lights installed in back of trunk lid, need to remove the socket containing the bulb, make sure the bulb is pushed in and reinstall socket, have even tapped on the lid at times and the lights begin to work. Also three of the tail light bulbs and one license plate bulb all of the same type have burned out and needed replacement, this problem does not seem to be normal considering have had other cars with over 100,000 miles and not had to touch a bulb.