It does suck that your Snap Shield or Snap Shield Secures are starting to crack, mine did the same thing in the corner and then started to yellow in any area where it had direct contact with the iPad.
I was pissed until I realized that you don't even have to speak to anyone at Belkin to get a replacement. I went to their website,
filled out the info and they sent a new one. Cost a few bucks for shipping but knowing that every time this happens it is easily replaced makes me feel better about it. Advanced replacement with no human interaction is fine with me. Hope it helps some of you out there.