I have Hangman's Alley as one of my 'themed' settlements. I've only got 4 settlers there. Two are dressed up like Minutemen and armed with laser muskets. They both man two artillery cannons. The other two are dressed in full BoS combat armor and fully upgraded auto laser rifles. They both man a guard post I have on either end (I never unchained the door for the third entrance). In addition there are several turrets and such. Couple pumps for water but no food as this isn't a farming settlement obviously. They are fed through the supply caravans.
Anyway I go to visit, just to see how things are and a Deathclaw suddenly spawns right in the middle of the place. Before I could even figure out what was going on it's blown away. I loot the body and start to walk away and another Deathclaw just spawns right on top of that one. Again it's quickly killed but at least I got a shot off on this one (not that it was needed). Has anyone else had Deathclaws spawn right in the middle of this place? More than once?
The other place that seems to get attacked every time I visit is Red Rocket. It's my main base and where I store everything. Seems I can't even start using the workbenches before I hear the turrets go off. Usually it's mutants or raiders coming towards the place from the small hill out front. They are mowed down quickly. Once it was a Deathclaw spawned right next to the place. Killed quickly but not before taking out a small turret. Thing is this happens at least 70% of the time I visit the place, and it always seems to start as soon as I start working on one of the benches.
Note these are not attacks that are listed in the Pipboy ever, they just 'happen' to occur when I visit the place (usually QT). Anyone else seeing attacks like this all the time? Note High defense doesn't seem to stop it as both places were well fortified.