Crossfire does not start or stops during drive

loud click? like starter soleniod!? that would indicate faulty connection/solenoid. loud click from solenoid can also indicate bad battery post connection/low battery voltage. battery can be low but "come back up some" from sitting awhile. enough to run starter again.

Dine -
It just might be the fuel pump relay. It'll die inexplicably, it won't crank, it doesn't store a code. Some of these cars sat in the dockside salt air a long time the first year, and that helped to corrode the relay's solder runs. The (unsealed) relay is a Hungarian bit stashed in the (unsealed) plastic box o' electronics under the hood, over the right tire near the firewall. Mercedes had the same problem, and it might be cheaper & quicker to order from them. Around a $250 part, and easy to replace.
Search it out at Crossfire Forums... it's a well-known problem.

Dine-
Mine has done something similar recently. The car wouldn't start (although there was no "loud click," it didn't turn over at all) until it had been left for a period of time - about 20 minutes, in my case. Since I had made several very short trips before this happened and the battery was original I decided to replace it. A day or two later it also *thought* that it had died when I was driving down the road - thought meaning the tach needle dropped to zero, all of the warning lights came on like I had just put the key in, and stepping on the accelerator did nothing. However, the engine was still idling; it seemed like the car just didn't realize it. A couple of days later (yesterday) it did the don't-start-for-20-min-thing again. I'm assuming it's some sort of ignition control/cpu thing, but haven't done anything to check yet. Did you get anywhere?