When you say that it is cutting out, do you mean that it is dropping out of the sky? is it possible that it is going into failsafe? That could be a cause of your quad cutting out.
some people build without connecting ground wires between the flight controller and esc, so that’s what I’m referring to by ground reference. You should have ground and signal wires connected between the ESCs and the Flight controller.
Hmm, check your antenna location. The Flysky isn’t known for having the best range, or latency…. you should maximize your range this by separating it from sources of RF interference.
Can you share more about your quad, type of flight controller? ESCs? etc.
Sometimes brownouts can be caused by a poor ground reference to your escs. also please upload some photos if possible.