OK, so you say the tires only have 150 miles on them. Like Nigel mentioned, have the wheels been re-torqued? One of the best things I have learned thru this group is to go back to the last thing that was done (new tires for you) and see what happened. You can chock your wheels, lift up each wheel individually and then place something on the ground just next to the bottom of the tread. Spin the wheel and see how out of round that tire may be. If it is, and after checking the bead next to the edge of the rim, take it back. Defective tire. It happens.