After about 15 months of owning my MA, all three batteries that came in the fly more combo pack are essentially toast. With 2 of the batteries, I've experienced a sudden voltage drop from 30-something % to 0% and the aircraft goes into landing mode. Luckily, I've been able to retrieve the drone both times, but it was not a fun flight. I monitor all of the batteries in AirData, and I'm now seeing major deviations in the third. I carefully follow all of recommendations on this forum as well as the care advice from DJI so I cannot imagine what I might be doing wrong. The # of charges on the batteries is: 49, 51, and 45, respectively. Any thoughts appreciated.