2000 Saab 9-3 choses when to start and when not to randomly
 

I have read a ton of horror stories about this problem I am experiencing with my 2000 Saab 9-3 choosing to start when it wants to. It started off a few months ago when randomly after driving a while and heating the engine up, I would come out of the grocery store after 30 minutes and it wouldnt start. No noise, nothing....all lights and radio would come on but no start. I would let it sit another 15-30 minutes and presto! It would start. Now, it sat overnight and would not start this morning. I have taken it to the dealer, they couldnt figure it out since it started everytime tried it and said they could only figure it out if it didtn start for them...this was a certified saab dealer by the way..pretty scary they didnt know what it was. Does anyone have any clue? I have read stories of people not being able to start my same year and make for days at a time with this same issue. Has anyone else experienced this? Please help, I love the car and am going to be forced to trade it in for a new car for little to no money if I cant figure this out. Thank you