If the DR is setup for DCHP instead static
Messages.log will show (service user is needed to access messages.log)
Jan 30 01:44:14 dr4100-6ppdr22 dhclient: DHCPREQUEST on bond0 to 255.255.255.255 port 67 (xid=0xc0dcb24)
Jan 30 01:44:15 dr4100-6ppdr22 dhclient: DHCPACK from 10.10.10.10 (xid=0xc0dcb24)
Jan 30 01:44:15 dr4100-6ppdr22 dhclient: bound to 10.10.10.22 -- renewal in 5356 seconds.
Jan 30 03:13:31 dr4100-6ppdr22 dhclient: DHCPREQUEST on bond0 to 10.10.10.10 port 67 (xid=0xc0dcb24)
Events log will also give a clue
1394853 INFO 2018-01-30 04:21:40 System IP address changed from <IP> to <IP>
Configure DR to use static IP
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