Do a hard restart of your console.
Choose the save before last.
Off you go...
If it happens when trying to go through the front door, try the one in the garage / motorpool or whatever it is called, instead. Might work.
thats odd...rarely a bug like that continues even after a simple game restart, let alone a hard reset of your console..
try a mission seperate from the BoS, then come back..
honestly I don't know...I have a PS4 ..but I doubt it erases game saves..maybe he meant resetting your Xbox and not just the game..
don't really recall any good weapons...but after while you have access to a vendor who has a gauss rifle behind him you can steal
?