The tires blew out on the nj turnpike while driving approximately 67 miles per hour. they are pirelli cinturato p7 run flat 225 40r18. one of the other tires has a bubble in it. the vehicles lost control and was swerving severely right and left almost doing a full 180 degree turn in the middle of the highway which nearly hit other vehicles driving over 65 miles per hour. vehicle is 2 years old and had tire issues at least 4 times prior to this incident. tire had pressure issue and was taken for service to mercedes of cherry hill nj approximately a month before this blow out.