I'm seeing the same thing on my dash. Funny enough it started about 2 months ago when I realized how much reflected glare I was getting off my dash in the windshield. When I touched the dash it was sticky. While it's sticky it's also fragile. So be careful not to clean it or touch it in any way while it's in this state.
As soon as I parked in a shady area, the stickiness for the most part went away. It wasn't as fragile either.
I did some digging on this and it appears the 2nd gens are affected by the same issue as the 1st gens but not at such a major scale. My car never had any products put on the dashboard and this is happening. I always use the windshield sunshade whenever there's sun.
I read somewhere someone had the same issue and they used Aerospace 303 cleaner and protectant. So with the car in the shade and the dash cool, I used Aerospace 303 cleaner 3 times. I changed the cloth 3 times as well as not to smear any of the stickiness back into the dash. After the dash dried I used Aerospace 303 protectant with the same cloth. I applied it two times. I let it dry and then with a clean clothe wiped down the dash again to take off any excessive protectant. So far it's working but I've noticed it started to leave some light haze which comes off with a dry micro fiber cloth.
What I speculate is happening is under heat some polymer is disintegrating within the dash and comes out when the sun hits it. A lot of these materials have UV protection but they eventually fail and the polymers fall apart as a result. You can try saving it as mentioned in my previous paragraph but that'll be something that needs to be applied every so often to keep it at bay. But I haven't had it going on long enough to say so we'll see.
But in essence, it's basically the beginning of the end for the dash sadly and replacement dashboards are expensive. A used dash might be an option but who knows how much life it has left.
