These messages usually related to issues with individual nodes.
Specific MessageID Results
A message was sent to the node and it was not acknowledged, and the device does not support the WakeUP CC, so its not a traditional sleeping device (Not to be confused with a FLiRS device). This could indicate communication issues, the Node offline, or other problems. This message is usually accompanied by other messages that will assist pinpointing the problems. Please consult DeadNode for further information.