What are some common TPO roofing problems?

There are many kinds of roofing materials out there for low-slope roofing. One type is a single-ply membrane, also known as Thermoplastic Polyolefin (TPO), the competitor of Ethylene Propylene Diene Terpolymer (EPDM). Currently, because of high-efficiency ratings, TPO is gaining popularity as a commercial roofing system. But in spite of this claim, what are some