I am a new Crossfire owner. I experienced the engine stall, followed by cranking without starting once. After half an hour, it started and worked for about 70 miles.
Two days ago, it died again, seven times. Each time the car took longer to sit before it would restart, and delivered less miles before stalling again.
I replaced the crankshaft positioning sensor. I will add some detail that I have not seen in reading this thread.

1.) To remove the wire from the sensor, understand that the wire and a plastic cup over the sensor is one piece. You are removing the plastic cup, not just the wire. On the plastic cup, under where the wire meets the cup, is a plastic clip that we are supposed to press in towards the plastic cup, which will release a catch further down on the plastic cup. I was unsuccessful getting that to work smoothly. Instead, I used a curved dental pic in my right hand, pried up the lower part of the clip (replicating what pressing the upper part should do), and then pulled the wire and plastic cap off.

2.) There is little room for big hands. Harbor Freight sells foot-long needle-nose pliers. I used these to pull the plastic cup.

3.) With the plastic cup and wire removed, the E8 torx bolt becomes visible. I used a ¼" drive E8 socked, ¼" drive extensions, and ¼" drive ratchet to remove the bolt. I used a claw-type part retrieving tool to pull the bolt without losing it.

4.) I see lots of suggestions to remove the heat shield. I also see lots of videos without the heat shield and some with melted wire and plastic cap. I left my heat shield in place for the repair.