I lost a plane to the Spektrum brown out last year......I was flying low when it happened, not enough time to recover. Worst part is, the battery seemed fine.....even after the crash. Had a momentary drop in voltage while flying the plane pretty hard?
I found one of these for $5 at my LHS. Called a "Voltage Protector", sounds like it might eliminate the brown out issues? I guess we'll see! (as soon as it quits raining).