Do you have an appliance that acts up and won't work at times? It emits mysterious noises, and then works fine when the repairman shows up? It happens to everyone. A major appliance or electronic product goes haywire -- with static, a strange clunk or total shutdown. But it acts up only part of the time, and when you call in a repairman, it works just fine. When an appliance starts acting up (this goes for electronic products, too) you can document the problem you're having, and make it easier to explain, by keeping a camera or tape recorder handy. When it starts malfunctioning, simply document the problem with pictures and sound.