My Xstr Premium was new in December and does not have a lot of flying hours on it. Yet the battery life has dropped considerably since December. Used to show around 25 minutes fly time when I started with a fully charged battery. Today I saw it showed 16 minutes fly time even though I had it fully charged this morning. Is this normal? The controller usually has at least 90% life left by the time the drone battery has dropped to the critical stage and initiates forced landing.