I have a 2005 Honda Civic. At some point in the last 6 months, I have had trouble starting it (intermittently). It would crank as long as I tried, but the car won't start. Most occurrences occur when I try to start the car after recently stopping it (e.g. stopping for gas). I can reliably replicate this by waiting 5 minutes in the driveway when I get home, and then try to start the car.
The relays were replaced a few weeks ago, and it seemed to fix the issue for a bit, but the problem came back recently. There seemed to be a progression of things slowly getting worse as it takes one or two more cranks to start until it won't start. The mechanic can't seem to find any other issues.
Why might replacing the relays temporarily fix this issue, and what might the actual cause be?