Intermittent Loss of Rear Speakers (02 Pathfinder)

[02SurfPathy]

When the problem occurs, I can pull the fuse and the rear speakers work temporarily. I believe this to be due to a possible problem and when the circuit gets re-energized it makes things work again.

Next time it went out I went to the amp and moved wires to all connectors and no change.

Pull fuse all good.

Next time it happened tapped on and wiggled fuse (already replaced fuse) and still no rear audio. Pull fuse and all is good.

The only thing I have not done is checked the head unit (because I soldered all connections to the head unit.

Suggestions??? Please