ok I need some help understanding what is happening to my paintwork, the respray is about 3 years old, is perfect elsewhere, and for some inexplicable reason it has now got a hair line crack where the rear drivers side wing meets the back panel this started about a month ago and now the front panel below the bumper has a crack where it meets the wing, all on the seams.

Any ideas.

Would a strut brace help to stiffen up the shell or would this just make it worse?

Really frustrating, our roads arent great, but I cant see this is it.

Would it be worth getting fixed or just forget, it is mostly dry here and the car is always polished (autoglm if that helps) and stored out of whatever weather there is. i'm wondering if its been nudged as I think the bonnet is also out of line a liitle and catches a piece of trim on the waist of the door now.