Anyone testing iOS 11 B1 or B2 experience that when they connect their device to a Mac using Sierra 10.12.5 they get a message in OS X that, "USB Accessories Disabled: Unplug the accessory using too much power to re-enable USB devices"? This happened in B1 and now in B2. If I revert the iPad back to 10.3.2 the messages never appear. I did submit this as a bug report. Wonder if others have it. This is with my iPad 12.9 second gen on my MBPro 2016 w/ TB connected via USB-C to Lightning.