Top Malfunctioned alarm went off when top was already fully closed.

Hello, Your largest cost will likely be diagnostics. It sounds as though you have a wiring issue, or a loose connector in the system. When you're hitting a bump, it is likely creating a short or open in a circuit. The good thing is that the alarm is going off all the time now. Intermittent problems are extremely hard to track down. When the issue is constant, the technician servicing your vehicle will have a much clearer picture of the fault.