Limits on Inviting new Members to my Yahoogroups?

I host (own) ccbroadcasters@Yahoogroups.com I have a daily limit of inviting 100 prospective members, but rarely invite more than 2-3. Yesterday I tried adding more than 50 and less that 100. This morning my daily limit was reduced to 5. I have not abused the system. Tried asking Yahoo directly but was told the system had a large backlog. Are others having this same problem and Yahoo working on it? Please respond to JohnBroomall@Yahoo.com