I have a 2008 cabrio and recently the top won't open at all. When I hit the button either in the car or on the key the top makes the click sound like it is going to open but it doesn't. If I keep pushing the button there is a clicking sound in the dashboard but the top never opens. I checked fuses 29 and 19 neither are blown. I left it alone for a half hour or so and then the top worked. So far this has happened twice. Thankfully it has only happened in the closed position, but I'm worried it is going to get stuck open at some point. Any ideas how I can fix this?