Jim. Go into the battery screen and turn on "show voltage" option. Then you will see the voltage of the lowest cell on the camera screen. It will turn amber, and if you don't back off the throttle, Red.
I have flown a lot in amber state during winter. If it turns red I back of throttle.
These battery's seem to have a hard time keeping up to demand unless they are 40c or more.
Especially when they have gotten down to 50% or less.
It doesn't hurt to look at your flight record in Msingers log viewer and/or healthy drones viewer.
If there is another problem it might show up there.