One problem related to car stall has been reported for the 2006 Porsche Cayman. The most recently reported issues are listed below.
The engine experienced a cylinder failure in the #5 cylinder. The #5 piston 'clipped' a valve, the valve dropped into the cylinder, the piston impacted the valve and caused the #5 piston rod to break loose completely and punch a hole in the top of the engine core. There were also cracks in the #5 cylinder wall. I had to purchase a completely new engine from the manufacturer and have my local dealer install it. The final repair bill was $25,000.