I would check the spare tire compartment for loose parts If that doesn't work just stop by the dealership or make an appointment. They are pretty accomadating over there. Call they may have the answer right over the phone.
Take it in and have it checked. They have a great service dept.
maybe its your tire jack try to tighten it.
Nick, I'm so sorry you're having this issue with your vehicle. You are more than welcome to give us a call to schedule an appointment (530-891-1777) for your vehicle so that one of our Nissan certified technicians can assess the issue. You could also visit our website to schedule the appointment. We have availability for the next few days.
It's Racoons living in your trunk.
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