rear view mirror

is there a way or does someone know how to keep the rear view mirror from shaking? i have the keep moving it down so i can see out of it again.

As suggested before............checked tire pressure? Checked for unusual tire wear on the fronts? Had tires rotated and balanced recently?

My bass shakes the hell out of it, and it stays in position.

thats weird i must have liek a weak one. cuz i only have 2 12's and it moves it upward lol

Same here, subs pounding, thigns vibrates like crazy but it stays in the original position