Yeah I'm assuming it wasn't attached very well. That facebook group is frustrating. Too many rookie mistakes, a lot of losses, but they jump on you if you try to give them information. BYC is such a nice place by comparison!
I'm in a chicken facebook group and keep reading about people finding hawks mysteriously trapped inside covered runs (that have different kinds of netting on top, or even a roof!) After some searching, the owners find that the netting/fencing was compromised somewhere - either the overhead...
If you're gonna need to sink a bunch of money into being able to keep the pop door open at night (presumably so you don't have to get up early and open it?), why don't you invest in an automatic pop door? It will remove the need to open and close the chickens personally and they will be safe at...