Oak wood floor is lifting

Q: I have recently laid a oak floor in my living room and dining room. The floor has started to lift. Is hardwood floor lifting up common and does it settle down after a while?

A: No, this is not common. Did you do moisture readings of the floor and sub floor first to make sure it was safe to install the floor? Did you acclimate the floor to your home by bringing it in for 5 days or more prior to installing? Did you leave an expansion gap along end walls?