Connection drops- Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c8:

I've been having random connection drops over the last several weeks. I migrated off an Arris SB6190 (which I understand to have a chipset issue) to Arriss SB8200 and while the connection seems more stable I'm still seeing drops. See info from the modem below. The drops seem to coincide with Connection drops- Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c8:    Info from router below. Any help appreciated. 

 

https://imgur.com/a/4DMiprj