Mine does that too.
Make sure all the bolts are tightened down TIGHT!
also make sure the center lock is turned and locked, that seems to make the most noise on mine, when I dont turn it to locked.
If that doesnt help you can pull the top apart and check to see if anything rattled loose. The cloth bottom will pop off revealing a sheet metal X structured subframe with a dozen yellow tabs ( the best way I know to describe it) attached to it. One of the tabs may have broken off and is rattling around in there.
Hope this helps.
Make sure all the bolts are tightened down TIGHT!
also make sure the center lock is turned and locked, that seems to make the most noise on mine, when I dont turn it to locked.
If that doesnt help you can pull the top apart and check to see if anything rattled loose. The cloth bottom will pop off revealing a sheet metal X structured subframe with a dozen yellow tabs ( the best way I know to describe it) attached to it. One of the tabs may have broken off and is rattling around in there.
Hope this helps.