From yesterday... I have around 22 dweller, and I just found that the radroaches can wipe a room with 6 armed dweller in seconds, if don't pop-up stimpak like candies, they are much much more stronger than any raiders or fire, even sronger than deathclaw in my first valut (hav 75 dweller). And Mr. Handy, they're said to be super durable, dies after two or three radroach infestations.
Any possible solution to avoid such superduper rad roaches? Or it's just some bug or glitch or design faliure?
Edit: It is said that a 3-space fully upgraded room will generate such super duper roach, so I may just demolish all the rooms.