I just got a case for my iPhone 5 and am noticing a deterioration in the speed and reception of my wifi signal with the case on. It's an Oakley brand case made with soft and hard rubber and plastics. There is no metal on the case so I wonder why the problem. I lose a bar in reception and speed drops in half while the case is on. I couldn't find any other mentions of this problem here, so am I alone? Is it possible it's the material of my case?
http://www.oakley.com/products/cylinder-block-case-for-iphone-reg-5/99210-001
http://www.oakley.com/products/cylinder-block-case-for-iphone-reg-5/99210-001