Clunk sound from rear suspension.
 

My car is bone stock with less than 900 miles. For the first 5-10 minutes I'll hear a random clunking sound come from the rear of the car. Has anyone had this problem? At first I though I ran over something, but it happens every time now.

Are your hearing it when you hit bumps? I had a similar sound coming from the rear suspension when I would go over a speed bump or hit decent road bumps. It is most likely your sway bar links engaging the small gap they have make sure they are tight but don't strip the bolt in the lower arm.