Me too. And it was quite regular. But it hasn't happened recently. Well not since I took one action. And I do not know if the action stopped it or whether the problem has just gone away.
You see, at the same time I was also being disconnected from my Yahoo Groups sites. Now I had joined WAMUG when it was with Yahoo Groups, and "My Group" was still showing me as being subscribed to WAMUG. So I unsubscribed from the Yahoo WAMUG group. Since then I have not received the message. Regards Joe