Weather and temperature changes can cause the glass to explode due to thermal stress. An old sliding glass door can weaken over the years, making the glass more likely to break. Landscapers working nearby may send small rocks flying, which can hit and damage the glass. A neighbor could have shot the glass with a BB gun. Children may have hit the glass with balls while playing.
Another way to make it safer and prevent it from shattering into pieces is to add a safety tint, which helps hold the glass together
There are many possible causes.https://sliding-glass-door-repair.com/aventura/broken-glass-repair