Hey there,
is it a common thing for a midi device (in my case the Korg nanoKONTROL2) to become unresponsive to midi mixer after computer sleep? every time i sleep my pc after waking it i need to restart midi mixer from the system tray so it will recognise the device again.
if that's normal behaviour, what about perhaps having a setting in midi mixer that allows you to force an app restart after wake from sleep.