Problem: The (automatic door) elevator occasionally stops suddenly during operation, then automatically resumes operation (actual fault code E42).

Inspection: 1. Check the connection between the door knife and the door ball on each floor of the elevator; 2. If the connection is normal, check whether the gap between the upper and lower guide shoes of the elevator is too large, causing the elevator to sway violently from side to side, causing the door knife to hit the door ball during operation.