I purchased my Mavic Air in April. I have the low battery warning setting set at 20%. Twice (a couple of weeks ago and last night) I have had the battery reach 20%, the drone begins to return home, tells me I only have enough battery to return home, and then immediately jumps to 0% (from 18% the first time and from 15% last night) and starts coming down rapidly...almost a free fall the first time - thankfully I was able to get the drone over grass before a hard landing. After these instances, neither battery will charge and the green LED indicators don't light up at all when pressing the button on the battery. When I put either battery on the charging hub that came with the Fly More kit, the LED indicator turns Red after a few seconds. Has anyone else experienced anything similar? Now two of my three batteries are inoperable. This is my first DJI product experience. Anyone from DJI on the forum who can provide guidance on how to remedy this? Thanks!