Seems like I may have had the exact same problem after I rotated tires for the first time. Hyundai replaced one front wheel bearing but problem did not go away. Thought that maybe it was my imagination but problem got worse. Ended up being that all 4 wheel were either all toeing in or toeing out, can't remember right now. Ended up replacing all tires, with Michelin picking up 30%. I would really have to say the the alignment was the cause. It might be a simple inexpensive check to check your alignment. Time will tell if the alignment was the cause but I am 99% sure, as the thumping is gone. Good Luck.