Internet drops same time every night

Every night at about 21:08 I lose all internet for about 5 minutes. the reccurring theme in the logs is below. 

017/12/25 23:10:34 Notice [Dhcpc][850]: wan0 T1 Expired, Enter Renew State
2017/12/25 22:10:33 Notice [Dhcpc][850]: wan0 T1 Expired, Enter Renew State
2017/12/25 21:11:33 Notice [Dhcpc][1505]: erouter0 got new IP 67.181.238.70
2017/12/25 20:08:46 Notice [Dhcpc][860]: wan0 T1 Expired, Enter Renew State
2017/12/25 19:08:46 Notice [Dhcpc][860]: wan0 T1 Expired, Enter Renew State
2017/12/25 18:08:45 Notice [Dhcpc][860]: wan0 T1 Expired, Enter Renew State
2017/12/25 17:08:45 Notice [Dhcpc][860]: wan0 T1 Expired, Enter Renew State

I have a bank of 5 static IPs on this business account. Why is it even using DHCP?

Model:DPC3941B

Hardware Revision:1.0