anyone know how to fix this? everytime i put the windows down about half way, they just fall down. the front of the window comes out of the slot its supposed to be in. is there some kind of clips that are supposed to be on the front of the window to hold it into that track? ive only had the door panel off once to put the window back in, but tomorrow i will take a look at it again. just wanted to know what i should be looking for before i get into it.