I just received my 88 MKII, and have been playing around with the Piano V2 software. Everything seems to work as expected, except if I walk away from the keyboard for a while, and my computer goes to sleep. When I come back and wake the laptop, it no longer has a connection to the KeyLab controller (the KeyLab remains powered on the whole time BTW). The MKII no longer shows up as an option on the Audio MIDI Settings dialog box under MIDI Devices. The only way I've been able to restore the connection is to quit Piano V2 and relaunch it, and once I've had to power cycle the MKII as well.
My settup: KeyLab 88 MKII running on USB power connected to MacBook Pro running Mojave, which it plugged into to mains power.
Is there a way to restore the connection without shutting everything down?