The car seat system on this device is defective. After placing the shell back on the base and it clicking/latching in place, the shell pops off with using minimal force. The bar with the little plastic arms do not hold the car seat in place. This is extremely dangerous for the child. The arms and bar should be replaced with something that locks in place. In the photos you can see where I circled in red, shows the parts that are unattaching. And the yellow indicates the wear/friction on the plastic surface from it sliding in and out of place. It also rotates of of locked by itself without holding the rotating button. There have been several complaints on this same issue. At this point a recall needs to happen before this car seat kills a child.