Tread Separation on Maxxis M8008

I've had problems with 3 of the 4 Maxxis tires I purchased in May of 2009. I keep my tires covered and in garage. All of them have shown tread separation. I am going to change last one so as not to have problems on road. Discount Tires have replaced the 3 because I bought replacement coverage. I can't afford to go to LT's since I have same tires as OP and would have to purchase rims too. We will see how this batch holds up.