As funny as this may seem, I had the exact problem. If I would jiggle the face-plate, it would come on, then off... You could actually tell that the problem was in the face plate, or the connection. I have no idea what the problem was (it was an old deck though, from 98... came with the car). When I replaced it, the wires were all connected fine, so I knew it wasn't that. Now that I have a new deck, everything sounds fine. I would first check the wiring of the harness (and of the amp bypass harness if ya got it), then go from there. It was the darndest thing... what goes wrong with a deck to cause that problem? No idea... maybe something screwed up for the fade/balance control within the deck. G/L though.
