Sandisk Ultra 64gb MicroSD Wont format.

I’m also having the same problem.  I can’t get anything to recognize the microSHXC (64GB) card anymore.  It was initially recognized by my Moto Droid Bionic.  Then it wasn’t.  My PC will only see it through Disk Management, but all attempts to format fail saying there is an error.  

Isn’t there ANYONE from SanDisk who monitors this forum?  How do I do a warranty return here.  I can’t find ANY information from this site as to how to get them to support their “Unlimited Warranty” for this product!

Scott