DHCP Server Losing default gateway after reboot

I'm having a very strange problem with our DHCP servers. We currently have
two MS DHCP server that are serving client in various locations doing an
80/20 split using IP Helpers. Every time we reboot the servers, some of the
scopes will lose there Default router attributes. No error logged, nothing
that indicates a problem, just no gateway. So each time we have to go back
and re-add the gateway back in. One thing I noticed today when going through
the scopes is that some of the lease times on the affected scopes were set to
0 0 0, and invalid configuration. Could this make the gateway disappear?
Anyone have any other thoughts on what is could possibly be.

Second part of the question, does anyone have any good scripts that will
allow me to check each scope to see it the default gateway attribute exits
after the reboot. We have hundreds of scopes, and manually checking them is
quite the task.