A mantra that we like to repeat often is this: 90% of all problems are cable problems. A bad cable can destroy your production. From pops in the interview, to a flickering client monitor, a bad cable can do all sorts of damage.
Cables are cheap, re-shoots are not. To avoid expensive problems keep two sets of audio, video, and FireWire cables with your camera bag. And when a cable goes bad, toss it and replace it.