You guys also didn't noticed that there's another guild update where your own guild gets removed for inactivity, even if you're active in the game.
It happen to my friend today that he hasn't used his own guild for 6 months, because he has in a family guild (and active) and now it got removed for inactivity and got refund.
So you pretty much have to maintain your tag as active as possible when you're in different guild or inactive.