Charging happens on a hardware level, not software. The only time
software 'might' have any influence or interference with a device's
charging cycle, is when it is powered on and charging. Power the Q2 down
completely then test its charging speed and...
My Q2 charges and works just fine with v43 as it did with v42. Sounds
like an issue on your end. You also mentioned charging the device with
an Anker (assuming) quick charger. Anker's chargers are known to kill
devices. I know I've lost a few to them...