I'm finding that numerous builds of mine work excellently the first few times I use them. I box them up, and they suddenly don't work. Through fault finding, I've noticed each time it's not just a wiring/ground issue, but it's a component failing somewhere in the circuit. Is it common for components to work for a while before shorting out or dying? I'm starting to suspect some 1uf poly film caps as the suspect, as crazy as that sounds.