I've had this happen a couple of times now, during "spirited driving" on some undulating country roads, all below the posted speed limit and complying will all laws, regulations and ordinances mind you, I've had the driver's door pop open to the safety catch. This usually happens after cresting a bit of a rise. Now I know convertibles are not as rigid as a fixed roof car, but I've never had this happen before on any convertible car before (including MGs :-o ). Is this just an adjustment thing or a worn part or may it be indicating some type of frame damage unrevealed/undetected by the previous owner and/or dealer?