If a ball bursts or loses significant air due to temperature fluctuations, this is NOT covered by the warranty, is not a reason for complaint, and no exchange or refund will be issued!
The ball should only be inflated to game pressure directly before use. Otherwise, always release some air. Do not leave the ball in direct sunlight (e.g., at the beach or behind a window), as it may burst. The same result may occur if the ball is used in cold temperatures and then stored in warmer environments. The air inside could expand and damage the bladder.