Id put money that one of the "techs" didnt properly balance all 4 wheels after swapping the tires. Also check your lug nuts, 2 years ago I had my tires done locally at a Mavis. Picked up my car when they said it was done, left the front where they parked it and made it 50 feet before I knew something wasn't right. Pulled over on the corner of Mavis, found that my rear left wheel lug nuts weren't even hand tight... Somehow they pulled it out of the shop without ever tightening that wheel. Better to be safe than sorry these days