What would be a good idea is to remove the sled from the car without disconnecting it, and check that none of the sled wires are pulling loose.

One thing I do now on all sled harnesses is to sort out the wires so that they run neatly ("Top" layer wires, "Bottom" layer wires) and then bundle them about 2 cm behind the connector with a cable tie. This gives a bit of strees relief and ensures no one wire is being pulled.

I am pretty sure my player has lots of little people in it, but they run and hide when I take the lid off so I've never seen them. Yet. I'll get 'em one day....