That’s definitely odd, I have the p4v2 and I can tell you just yesterday I was flying for a property that was on top of a mountain and I was able to change it with the drone at max height of 393 ft (what I keep mine at)to 800 ft to get up top safely. While flying I just stopped, found it in the settings under the drone tab( I think it’s the first one) scroll down and change how many meters you need to go.
Good luck, it sounds as though you are looking in the right spot though.
I did keep my sensors on but that should make a difference either way.