About "Device is ignored temporarily" alert

“Device is ignored temporarily” alert will be shown in any of the following cases:

• If you hold keys or buttons down before Karabiner-Elements open the device.
• Your device sends unintented key up events regardless you do not touch the keys.
  (e.g., Swiftpoint ProPoint sends key up events of the music play key periodically.)

Press the described key or button again to dismiss the alert.