5 typical reasons why rear glass gets damaged:

Weather: Harsh weather conditions, like hail or strong winds, can fracture or break back glass.

Manufacturing faults: On occasion, a manufacturing flaw could result in broken rear glass.

Vandalism: Vandals may throw objects at or use sharp objects to scratch back glass, which can result in damage.

Age: As a result of wear and strain, back glass may become more vulnerable to damage over time.