Okay, relays in question:
I upgraded the relays 2d15h ago to Tor 0.4.6.0-alpha-dev
since then some of the relays are voted to be seen offline.
all of the relays are on servers which were not offline the last days:
exit@worlddomination3:~/relayon0301$ uptime 22:15:16 up 33 days, 23:23, 1 user, load average: 41.39, 39.65, 38.87
also, my own AS was online:
So every relay which is less than 2d15h online was voted from the auth servers to be seen offline. I do not see any pattern in this. Relays go down and after a few hours they come back without any change on the server or relays.
Just to make sure: relays, server and routing works. The relays in question are just shown offline in Atlas...