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Neutron - dnsmasq reloads causing dhcp failures

Hi all,
We have a relatively stable 140 node Openstack deployment consisting of hypervisors and bare-metal.
Periodically, we have observed that the baremetals timeout during the PXE.  We have been able to reproduce this relatively easily by rebooting several baremetals simultaneously.I believe I have traced the issue to the dnsmasq reloading every time an entry is added / deleted.
Can anyone who has experienced similar issue provide feedback on what you did to work around this ?
For what it is worth we are on a stable Queens release.
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