Hi,
Can you be a bit more specific about your issues and your setup ?
Open the Midi Control Center with the KeyLab plugged in your computer, in the "View" menu select the MIDI Console. Press the key that does not work on your device and see if any MIDI data is received.
What happen when you open Analog Lab in standalone mode ? The keyboard is not working at all ?
You can still try to do a factory reset, to do so, hold Oct + and Oct - while powering up the device.
Matthieu