Some owners of the Galaxy S3 have reported unexplainable cracks in the ‘metal’ edge of the Galaxy S3. According to the people having the problems, the cracks occur without any reason.
The small fractures appear on the top, bottom and sides of the Galaxy S3. The problem doesn’t appear to be to common, out of the million phones in use, only a small amount of users has complained so far.
The interesting thing off this problem is that you would expect damage like this to occur because of abuse to the phone (like dropping it). However users report that the cracks occur out of nowhere.
Samsung has not responded to the problem yet, and for now it remains unknown if this is a wider spread problem, or just a few production mist stakes. (which you always have when you produce around 10 million phones!)
A reason for the fractures to occur could be the different thermal coefficients of the materials used for the phone and the outer edge. When the phone than undergoes big temperature changes, the materials will expand differently causing stresses in the edge. When the stress becomes high enough, cracks can occur.