Random/intermittent problems are difficult to diagnose.
Start with main battery connections, make sure they are clean and tight.
Next disconnect electrical connectors and spray with electronics cleaner.
Mechanics have a device which will trace shorts or open wires, but it is labor intensive.
The other possibility is the ignition switch is faulty, like turning the key off.
Monday, October 4th, 2010 AT 8:49 AM