Ring cam 1 battery low/other full offline till low battery removed

Battery cam has been very reliable. In the last week I noticed it was offline for about 2 weeks. Left battery showed low/dead and right battery full charge green. Removed left battery and back online instantly. Batteries are matched pair and not a year old. Other cam of this type has low/dead right battery and functions normal off of left side battery. Both of these units, if I remember correctly, were purchased at the same time and supplier.