Lately I've been getting spammed with settlement missions. What drives me nuts is that if you don't get to them soon enough, they auto-fail. I've spent more time running around settlements than I have doing anything else.
Not sure if it's a bug or not, but I went to one of my settlements that needed defending. It previously had about 4 or so occupants. When fast-travel to it, there are ~30 brand new settlers just waiting at my gate. One runs up asking for help with mutants. About 15 seconds later, a group of super mutants and hounds rushes the compound. 3 mini-guns, 2 suicides, and 5 hounds. Got em down, but then had to figure out the logistics of what to do with the rest of the people.
Got it all straightened out and went to go to another mission. When I get to the location, I get a pop up saying "The Castle defense failed". I check the rest of my missions and The Castle, Coup Manor, and Jamaica Plain needed defending. Every one was group of super mutants.