Hi @Hugues
both are PixRacers. But this is not a pixracer issue. Some more number can be found in this discussion:
http://discuss.ardupilot.org/t/copter-3-5-rc3-released-for-beta-testing/16035
Worth some more tests I guess (especially with current master, since there had been quite a few updates over the last days). Not sure if or how problematic the NLONs are and in which range. But the flight performace was always ok.