I find that when I have stopped a sharp or long yaw the view appears to drift back slightly, I attribute that to the electronic yaw on the two axis gimble. But I also find it slowly yawing after initially settling down from the electronic stabilisation.
There is a Solar Storm Forcast between
15:00 UT 14th March to
06:00 UT 15th March.
Reaching G1
(UT is GMT in the United Kingdom )
At its peak the storm could have adverse effects on GPS and Compas systems.
Please pass the cautionary warning on to your RC flying friends and groups.
I think its all to do with balancing the batteries. I don’t believe they are being charged in Parallel.
They have chips in them to manage their charge etc. Just be patient if the battery is serviceable it should start charging.
I dont use your phone or Android but just a thought.
If your trying to connect up from home your home WiFi might be still connected to your phone preventing you from connecting to your controller. If you haven’t already done so try disconnecting from your home WiFi.