LD's becoming unstable

Usually it's fairly easy for me to stabilize my LD by simply rubbing my hands, looking around and concentrating on my surroundings, and by telling myself (out loud) that I want the dream to be stabilized. Lately though, my lucids seem to be unraveling fairly quickly which is major buzz kill considering I just learned how to fly. =/

My WBTB time has been a little longer than usual so I'm guessing that might be it. If so, is there any way to counteract the effects of a prolonged WBTB time?