2004/5 Solara convertible

Hey guys and gals,

Anyone here own an 04/05 Solara convertible? I just bought my first convertible, and have noticed that from the rear over heavy bumps I can hear the sound of creaking styrofoam coming from under the top.

The front and rear bumpers have styrofoam in them, so I would just assume that the section under the convertible top has this as well.

Anyone else notice a sound like this? Is there a fix or reason why?

Thanks in advance!

Vitaly