What you have to remember: provides the USB connection already little power and is the Micro-USB cable also "inferior" it may well be that with the adapter then finally it's over. I realized that even cheap Lightning cables that charge the iPhone, slower load (or in some USB ports do not even) than original / licensed cable. Tested with the USB Power PortaPow monitor power meter / power meter / digital multimeter / ammeter V2
And micro-USB cable, it is probably no different: not every one is suitable for ordinary charging current. Could imagine that a "source of interference" is also available through the adapter and therefore the loading then fails.
To all, therefore the iOS have 8 problems: please test times with different microUSB cable and a USB 3.0 (provides more milliamps available) or an extra "charge" USB connection with 1000mA try up! The adapter can perhaps not my fault.
