Hi Tim,
I have a minor issue when I shutdown Moode when using the Pi-3 (versus the Pi-2) and using a "power bank" (Li-ion 5V portable phone chargers) to run the Pi:
Normally, the power bank will shut off with the Pi-2 but the Pi-3 seems to draw more current in the off state and exceed the threshold limit of current that the power bank unit senses to
power itself down. This
link indicates that it is drawing about 220 mA when powered down.
It is beyond my capability to sort this out but I thought it might be in your ballpark. I will update to the new kernel allowing the BT to be shutdown to see if it might be related to
this new functionality in the Pi-3. No rush. Thanks.