Hi GFX, what were you able to find out? I just took mine in for the same symptoms and they charged me over $800 for a new fuse box and cables. And 10 minutes later, it starts doing the same crap. Door locks go off and on, traction control comes on and then the engine shuts down. When we pull it over and put it in park to start it the Stabillitrak Service light comes on and then it starts...though not instantly.So I encountered somewhat of the same issue.
Driving down the highway, my 2013 2.5L ATS stalled. It.took maybe 30 seconds to get running again. OneI turned it on, the service stabiltrak message appeared on the dash. Thecar was very under powered and the RPM gauge.stopped working.
What I replaced so far from suggestions.
All 4 coil packs and plugs.
Camshaft positioning sensor as that code appears twice on the obd2 reader.
After replacing all this. I still have the same symptoms and the code p0035 keeps poping up which is the camshaft postioning sensor. Please advise before I take it to the stealer.