mine did the same thing. there is a spring that controls the up and down movement of the hud. that springs is held in place by a clip. most likly your clip broke so its not holding it in place. there is a cheap and easy fix. but you have to take the dash off and get to the hud. once your in the hud you will see where it broke, simply glue some washers in place and reatach the spring. i have not done mine yet so i cant really help you.