8.1.1 showing wrong battery voltage, huge delay from controllers

[Robocoder9000]

Having updated our phone and Control Hub to 8.1.1, DS is now reporting battery levels from 6-8 volts (battery was measured at 12+ volts before and after). When running our driver control op mode as well, we get around 1/2 to 1 second of delay on all movements. Reverting to v8.0 seems to fix the problem.