As I see it, everyone's Phantom is a little different. I don't get anywhere near that. I flew out to 6000 feet today and that is a personal best for me. My signal bars tend to go from perfect to weak.... no in between. I think it might some interference because of this and because when I move back a few feet and into a strong signal, it's rock solid again.
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Seems there is something wrong with your P3, my 1st flight went out 5,000' no problem. You should in no way be encountering signal issues at 300', talk to the dealer you got it from, let him test it.My range is pure ****. I have no idea how you are getting that far. With a 200ft altitude I go like 300 ft out and it starts turning red and I have to turn back. I've tried at 2 different locations and had the same experience