From the pictures, you are direct wiring the kit. With that information, I would suggest checking the Purple, Green, and Blue wire wiring from the Digital connector (the one on the Raduino/Display/Nano board).
- Purple should not be connected to anything.
- The Blue wire goes to the tip connection of the 3.5mm Jack
- The Green wire is soldered to the 4.7 k resistor and the other end of the resistor to the same tip connection as the Blue wire.
I cannot see if the connections are correct. I lose the Purple wire in the area around the jacks. I would look there for an intermittent short. Those are the wires that get disconnected from the Raduino when you pull the header off.
I am really thinking it is a wiring issue.