There is probably a short that says the top is about to be opened and starts the cycle.
For not knowing anything about convertibles, onehundred80 is spot on.
The top pump module is in the left rear, and it's the guy that gets the signal to lower the top, so the first thing he does is signal the windows to drop when the "D" handle is turned and the top is partially raised. This signal comes from the "top raised" switch, the one above the passenger's right ear.
One member recently reported that he found the mounting screws for this switch loose, seems they provide a ground for the circuit.