I just contacted Lenovo Support yesterday and will be sending them 10 Chromebooks.
Some never powered on after the initial setup and others worked for a few days and now no longer want to power on or charge.
I'm holding off on ordering anymore N22 until Lenovo lets us know they've corrected the issue.
I have a few N20 which drop off the wireless, and I'm still not aware of a solution for them
call 9500066661