Phillips cd pro 2 center hub has cracked 2 times on my Audioresearch CD 9 Cd player

I've owned this player for less than 6 months and have cracked the plastic centering hub twice so far. Though it's an easy fix does any have any ideas why this might be happening?
When I place the disc over the hub the disc isn't laying flat on the turntable I have to snap it down over the hub. I'm sure this force has caused the hub to crack.
is it normal to have to do this?
No, it is  not common. I suggest you take more care when placing the CD on the hub. Apply equal pressure on both sides of the disc around the center hole.
Odd and uncommon at the same time? Perhaps you are pressing too hard on the hub?