I went out this past weekend to fly my shiny-new BoT, all-up weight 42 ounces. I think that's the lightest-loaded sailplane I've ever built. Moderately lumpy day, 10 knots, unsteady velocity and direction. Airplane behaved unusually, exhibited behavior I've not encountered, it flew along, interspersing steady states with pitch-down bumps and recovery. Gusty days I've seen bounce noses up when a gust comes with the prevailing wind, so that momemtarily the airplane sees more airspeed, but bumps 'down', and lots of them, are new to me. Any thoughts as to whether I saw weather-induced bumps or receiver (FMA Extreme 5) glitching )? Yes, the range check seemed all right, and I had good control during the flight. Thanks, folks.