I am presently staging an environment with 10 gateways. Now an then one of those complains about the issues described above, but few hours later Status changing to "All is well".
Needless to say, those are configured identically and should there be any configuration issues, those would've been consistent.
I've seen the same behavior in at least three other environments and , because of the transient nature of these errors, I am inclined to suspect CP's services availability.
As to the notification icon in the status monitor, it would go a long way to assure clients that it is not an imminent problem requiring immediate attention and efforts.