Apple is experiencing a slowdown in the iPhone 5 production as the company is trying to enforce a tighter control over the manufacturing process. The company is working with Foxconn to lower down the number of devices shipped with nicks and scratches. According to an anonymous source who spoke to Bloomberg, the build quality issues and chips of the iPhone 5 are due to the special aluminum Apple has decided to use for the smartphone, which allows the construction of the thinner and lighter body. That's why senior Apple managers have forced stricter quality control policies on Foxconn's manufacturing locations. The implementation of the new benchmarks has even resulted in idle factories, which in turn should lead to iPhone 5 shortages in the near future. According to Bloomberg supply concerns have already cost Apple about $60 billion in market cap since the iPhone 5 debut. This report gives some credibility to the story about Foxconn Zhengzhou workers going on strike.