2nd ? first, I would guess you have a short circuit in the hatch wire harness that is making the solenoid misbehave. Inspect the wires in and near the rubber boots by the hinges. If those are OK, take the plastic trim panel off and inspect the wires, wire connector, and the solenoid in the hatch. Once you have that fixed you might find that the speakers work right.
Describe how you hooked up the speaker wires, what type of wire you used, and where you made the connections on both ends of the wire. As suggested, inpsect the other wires in the door wire harness for chafed insulation or other damage.
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