Brake Loud Noise problems of the 2002 Oldsmobile Alero

I purchased a 2002 Alero from the dealership. It had a certified sticker and a warranty on the window. After signing all papers and putting $2,000 down on it, the sales man informed me that there was no warranty due to the age of the veh. About a month later, I began having issues with it. 9-5-07 the brakes were squeaking and making loud noises. I had the dealership repair it under warranty. On 9-10-07, the front wheels began to shake and heard a loud noise as if the wheels were going to fall off. This happened by the dealership as I was going to work. I dropped it off and it was repaired. They said it was their fault due to a few nuts or bolts fell off. 5-6-08 is when the car completely left me stranded. Turn the key, all lights come on and seat belt alert came on. It sounded like it wanted to start but it wouldn't. I had it towed to the dealership. It cost me $588. 00 to repair it. They said it was the pass lock sensor. 9-3-08 my car left me stranded again. It had the same issue as the first time. It sounded like it wanted to start but it wouldn't. Had it towed to the dealership again. They quoted me $350 for repair it. They said it was the anti-theft mechanism in the ignition switch. After speaking to the manager, I paid a $50 deductible and the veh was supposed to be repaired. On about 5-9-09 the veh left me stranded again. It displayed the same problems as the prior 2 incidences. I had the veh towed back to the dealership and this time they said after the diagnostic, it was the bcm and would be approx $480 to repair it. A few days later, I had a friend to help me tow it to my home. I turned the key and it started up fine. I called the dealership and I was told it is the bcm and if the veh sits long enough, it may reset and start up. He also said it may leave me stranded again. I have been driving the veh locally and on 11-27-09, the veh will not start.