C7000V2 - Spectrum Cable - every night resetting at same time

I have spectrum cable - ARRIS TM602G modem with C7000v2 nighthawk modem/router combo.   Every night at 12:15AM  my wifi goes off line for couple of minutes.  

My event Log shows:  

- Resetting the cable modem due to docsDevResetNow

other logs verbiage has:

- SYNC Timing Synchronization failure - Failed to acquire FEC framing;

- No Ranging Response received - T3 time-out;

- Overriding MDD IP initialization parameters; IP provisioning mode = IPv6

- Missing BP Configuration Setting TLV Type: 17.8; 

This in general would not be an issue given the time of day - but while all of my devices reconnect with no issues - I have  4 Ring cameras - where 2 of them will reconnect and 2 will not reconnect until 12 hours later, then they reconnect automatically. 

3 variables -  NIghthawk, Spectrum Cable and Ring cameras.  

Starting point is the 12:15 AM event log - so trying to determine if this is a spectrum issue or  Netgear router issue.  Of course spectrum says the netgear is defective. 

I have hard re-set the nighthawk multiple times as well as cameras, etc. and  to no avail.  The  events happen like clockwork and cannot find the root cause.

appreciate any ideas.   thanks