Too much water.... Dead.
To little water... Dead.
Not uncommon, right?
I've also had stuff get severely sunburned and die. I lose several to bring incarcerated in the dungeon each winter.
All the repotting for the last couple of weeks are soaked. It all started last night And there is no end of rain until at least tomorrow.
That said, I also have very little shade on my lot for to the West/East orientation and the lack of trees. But it's really puzzling to me... Aren't most succulents out in the open and unprotected from harsher afternoon sun? Can anything be done with severe sunburns on succulents?
Oh, and are there any Echeveria species/varieties more suitable for unprotected sun? If like to have some that also have flowers which are used by hummingbirds. Most nursery labels say full sun when it looks like they mean different sunlight until about 11 am and then shaded from the sun the rest of the time.