From my own experience, it's probably the person who installed the tire did not seal the tire properly. The simplest way to make sure if there is leak at the seal is to take off the wheel and use hose and rinse on the tyre and see if there is any bubble. If the bubble is at the place where tyre attach to the wheel, just go to the tyre shop where you install the tyre and ask them to re install it again. Hope this helps. Good Luck