Suggest to visit workshop for repair, usually the keypoints of repair are:
1. Detail lubricating the glass channeling guide, replace the guide if necessary.
2. Check if the regulator handle is broken, if the steel lifting cable is broken, if the window regulator assembly is faulty, if the related screw is loosen. Tighten the screw or replace the part if necessary.
3. Check if the position of the steel lifting cable is correct, adjust if necessary.
4. Check and adjust the window glass bracket position.
5. Perform testing on the window to ensure the problem is resolved after repair done.