DHCP RENEW WARNING causing no internet connection every night at the same time.

I'm getting DHCP RENEW WARNING  - Field invalid response v4 option;CM- MAC=2c:9e:5f:dd:67:f

when I login to my cable modem at http://192.168.100.1.

then I go to the configuration page and reset the cable modem and it works again.

why does cox keep failing to renew my dhcp?  can you change the server to lease the dhcp for longer than the 24 hours? like 2 weeks or so.