Intermittent resolution to old address for root domain.

[tradebledsoe at yahoo.com]

Any hints would be -greatly- appreciated.

Verified that the registrar points to the same NS servers listed with
NS records in the zone file.

foo.com has an A record pointing to the address of ns1.foo.com.  It
used to have an A record pointing to ns2.foo.com.  After changing it,
we are seeing the IP for foo.com flip back and forth between the
correct address and the old address outside of our own network.  This
has been going on for over a week now.

dig @ns1.foo.com foo.com gives the proper address.
dig @ns2.foo.com foo.com gives the proper address.

Even more bizarre, www.foo.com is a cname pointing to foo.com, but
dig'ing that cname shows the proper A record for foo.com -every- time.

Our TTL is around 10 hours, and EXPIRE is around 1 week.  We are
almost a week and a half out from the change.

Any ideas as to what we should look for?