The battery is less than 6 months old. I have recently had the fluids flushed. Yesterday on 2 seperate occasions the car woudn't start. The first time the car had been sitting for approx. 2 hours. The second time, hours later it had only been sitting off for 5 minutes. The needle that points to the MPH was shaking so I pressed my foot on the brake and it started. I took it to Auto Zone and they said it could be a loose terminal. I tightened it and haven't had a problem since. I am worried that it could be more serious.