Yesterday i got my P3S out and decided to take it to the highest legal altitude ( 400ft ), i went straight up and then got the maximum height reached, showing around 391ft on my phone. Then it started saying week signal i started bringing it down and then it said signal lost ! It then went back to green GPS almost instantly. I don't know if it was the wifi signal or the remote signal and i can't seem to pull up the notification in the DJI app. I have taken my drone out further than 400ft before with no problems just not up 400ft high could this be todo with my antenna position or something ?