I've been running XNTPD for almost a year with little problem. After
introducing three NW 6.5 SP7 servers into my environment (NW 6.5 SP5+
eDir I've been losing Time Sync and "Synthetic Time is being
issued" messages.

Any ideas how to fix it? I have one server configured to look out to
"pool.ntp.org", "0.pool.ntp.org", "1.ool.ntp.org", and "2.ool.ntp.org".

All other servers are configured to look to that server for NTP time.
There are a total of 12 servers looking at the "Master XNTPD" server.