The main reasons glass comes out of a sliding door frame are:
Loose screws over time Screws that secure the frame can gradually loosen due to vibration, frequent use, or building movement. Improper reassembly after service This happens often when a technician services the sliding glass door and forgets to reinstall all the screws after reassembling the frame. Greased or dirty tracks causing excess force When the track is greased, it attracts dirt and debris. This increases resistance, and forcing the door open or closed can cause the glass to separate from the frame.
Polished alternative (more formal tone)
In many cases, glass comes out of a sliding glass door frame due to loose frame screws over time or improper reassembly after recent service. Another common cause is excessive force applied to the door when the track is greased and contaminated with dirt, which increases resistance and can cause the glass to disengage from the frame.