My 1998 Audi has been giving me ignition problems. Just this morning after putting Gas and leaving the Gas station, It shut down at a light in the middle of the street. While attempting to start, the ignition sound started but it will not turn on. Someone help me pushed it to the side of the road. I OPENED the Hood and touch the electrical wires... Left if for alone for about 5 mins. Then it TURNED on without a problem. Then this past weekend and after sitting in the sun all day, it turned ON but then parked for about an hour and it didn't turn on. I came back in the evening and it turned ON without a problem. PLEASE help me to determine the cause of this problem because it is driving insane. THANK YOU SOO MUCH in ADVANCE!