Exactly. The deadlift itself does not stall. There is a muscular weakness that is holding you back. Find it and strengthen it...your deadlift will start moving again.
It's more than likely glutes, hams, low back, or abs....shouldn't be too hard to find.
I think B is actually asking what support lifts you're doing for deads, like rev hypers, box squats, etc
Anyway, I would personally up the number of sets from 3. Not sure how the others around here think of it, but I don't deadlift every week(which is hard because I love to dead). When I do them every other back day, I notice a steady increase in numbers. That seems to work well for my lifting partner as well.