I can fix most hardware problems now. Something's broken, I find it, I swap it, done. But the ones that only act up when I'm not looking, the ones that work fine the second I test them, those beat me. I've spent whole days chasing a fault that vanishes the moment I try to see it.
More people experience this than they realize.
You can fix clear faults, but the ones that won't reproduce defeat you.
If this sounds familiar, the Library can help you find the bigger picture.