2014 Terrain 60,000 Mi. Vehicles Vibrates For 3-5 Secs. Feels Like I'm Driving Over Rumbles Strips. Has Done This About a Dozen Times in (3) Months. Is Starting to Concern Me. OBDII Codes Checks Showed "No" Active Codes From "Any" System (or) "Any" Stored Codes in Memory. Afraid to Take Vehicle on "Long" Trip. 2014 Terrain 3.6L 6T70 Tansmission AWD. Any Experiences or Advice For Fix and/or Problem Will Be Appreciated.