i think its because mine are cheaper bulbs. i'm not having the trouble much anymore since its not below 45 degrees, thats mainly when i'll have problems. i of course just had to have the 8000k bulbs.
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*