I have a 2017 Ltd with the same problem, but I be very careful with it when open and when closing. The problem I think is in the hinge arms and the hinge itself, for the lid, then are just NOT strong enough, so nothing is going to help your problem when it's windy (just hold on to it with one hand). The closing of the lid can be helped with the shims or with a luggage rack attached to the top of the box. I don't like the rack idea because it adds extra weight to the lid and a strong wind could brake loose the hinges (just my thoughts). I plan to order the shims just to aid in closing the lid securely. Just my thoughts on my problem........