So about once a week my car won't start on the first attempt. It will finally start the 2nd or 3rd attempt and not have any issues for 1-3 weeks. Then the same thing will happen.

Had the battery tested (was a lil low) but everything else was fine. The battery is 8 months old and has 575 CCA. Is this not enough amps for my NY winter?

If it isn't the battery any other thoughts? Why would it start after the second attempt and be fine for a week?