In the past 2 weeks, my 2005 9-3 2.0t Sedan has experienced intermittent power shut downs while driving. Twice while crusing at 75-80 mph on the highway and once while pulling out of retail center at 5 mph. All of the electrical system continues to work, but the check engine light comes on. If it sits for ~20 minutes it starts right back up. The mechanic had no tangible answers after the computer diagnostics were done. Any thoughts or ideas? I love this car and have never experienced any problems, but now I'm terrified to drive it!