Mine too till I learned how to modify the anntennas and the Extender. Now - Works like a charm.. I say that and fully expect the gremlins to punch me in my noes.
Most likely when she is right above you the antenna on the quad are on the backside of your wifi extender and loose signal due to that. You may have to hold the RC tilted way up so the extender points at the craft and not towards the front. Try moving the copter out in front of you at the same altitude and see if she stays connected.
Fly in airplane mode with WIFI on. My P2V would disconnect at about 30 feet with airplane mode off. Turn it on and it is steady to 1500 feet (without line of sight).