Recently we’ve started to get the following alerts on our Sentinels (we have three).
No network connection available
No ethernet ports are connected.
We don’t know what causes it, but it resolves itself.
All Sentinels have two network cables plugged in, and all six cables are brand new.
We don’t notice any loss of connectivity, and we don’t get the “Redundancy Lost” alert beforehand, so it’s extremely unlikely to be an issue with the physical ports/cables.