Same thing applies to our third gym ... it is a triple court gym, two hardwood and one rubber floor with massive fold out bleachers on both ends. The facility has been open for two years and the rubber floor has been torn up and replaced both years. Every time they roll the bleachers out it somehow bubbles. It is a poured rubber floor that is allowed to set two weeks longer than the manufactuer recommends. How it bubbles is beyond me. God forbid the company does a little R&D to fix the problem - it is under warranty so it costs them a ton of money to replace it. Not my problem, I will more than welcome a new floor every year.