As a roof expands and contracts the roof system moves. This is a daily occurrence and is associated with Thermal Shock. During movement the tiles bind against each other. Sometimes a tree branch or flying debris may impact the roof causing damage. 3rd party damage is another issue. As people walk across the roof they can cause damage. The Tiles on this Estero roof have been damaged. Since this leaves the underlayment showing, it is our recommendation these areas are repaired.