Roof button not working properly

Every week I always test to make sure it works but I just checked to see if it works but the button won’t move without excessive force. I put force, it opened and closed but I was wondering what the problem could be to me having to put lots of force (1992 400e)

Every week I always test to make sure it works but I just checked to see if it works but the button won’t move without excessive force. I put force, it opened and closed but I was wondering what the problem could be to me having to put lots of force (1992 400e)