It is always the small things that cause the biggest of messes

Once I was facing an issue with integrating a component. Searched high and low on the internet, tried what little was there, resulted in nothing. Took help from SMEs, still nothing. We all kept scratching our heads as to why this error was coming. The astonishing thing was that only this particular instance was causing trouble. The component was working fine everywhere else. We were trying all possible things, and I knew it in my gut that the problem wasn't with the component, it's somewhere else. A few days later a thought striked, and I followed through. And what do I see, the error was resolved. Literally the most basic thing, that was already implemented, I just redid it and bam! This is only one of such incidents that have now solidified the following thoughts: 1. It's always the small things that cause the biggest of messes. 2. Always listen to your gut. 3. The error is where the impact occurred, don't get blindsided by it. The root is somewhere else. What has your experience been?