Aren't roaches supposed to be small and brown? Why all of a sudden am I seeing large, super large, roaches around the house? Then, the unimaginable happens. One of these roaches fly at me.
That's the story I used to get from families as they call in a panic looking for help. Sounds like these families are experiencing a problem with American Roaches. Aside from treating the home, I would ask if they have done any plumbing work inside or outside the home. Usually these roaches are introduced into a home via a broken sewer pipe or if there is any excavation work close to the home. The other possibility is if a neighbor in a row home or condo has a problem like the one described above, and the bugs are overflowing into your home.
So if you suddenly start to see these large roaches in the home, call your pest professional and check your plumbing.