From a Drone savy member of the forum named GadgetGuy from an post long ago.......This just may be whats happening
""You have to be inside the unlock when you launch, because the area outside the unlock automatically becomes an NFZ. If you...
this has happen to me with an Autel evo 2 pro drone ,since most batteries are SMART batteries they have firmware in them and can go corrupt
**** happens
I have seen racing Drones flash like a meteor in midair from the pilot “pushing” long and hard on the throttle and you can intentionally do it by giving it full throttle and not letting it go…I know a DJI fpv will cook its battery in a very short...
Unfortunately the screenshot doesn't show us voltage levels, but it does, as you say show you back at 87%.
But it also shows that at the time of the screenshot you were slowly descending and not moving very fast, so whatever sag had potentially...
I know that quite a few Scots are keen on making the break from Britain, but unless Scotland has become the 51st State over the last few days: American regulations don't apply north of Hadrian's wall. 😁