@Jonathan_Pitts the ticket # is 25041234
Changing DNS settings often seems to fix it temporarily.
I’ve seen this behavior in 8.4.x and 8.5.x - can’t say if it was in 8.3 or not.
Of note, several of us noticed that it showed up immediately upon rebooting after an upgrade from 8.4.x to 8.5. See discussion here: VLAN Not Getting External IP Access