Edges raising in centers of laminate boards

Q: We had a laminate floor fitted 6 months ago, and some edges in the center are raising slightly. Also, there are slight divisions becoming apparent in some areas. Is this expected or should I complain to the fitters?

A: This type of flooring is supposed to be more stable than solid wood. Not all are created equal. what you describe is usually a symptom of excess humidity swings. During installation, a gap should have been left along walls to allow for any expansion. That may be an issue here as well as the product you had installed. I wouldn’t consider it normal or desirable.