problem with dynamic dns

I have an Apache2/ssl server on a dynamic ip address with dns serviced by a
dynamic dns provider. The problem is that if the address changes, after the
dynamic record gets updated, ssl no longer works.  Any resources for which
ssl is mandatory produce only server errors.

Apache seems to cache some sort of dns information in-process on startup.
Restarting my httpd proccesses fixes the symptom, but I don't want to
restart it every 15 minutes. I'd like to know what is happening and what to
do to mitigate this..