Intermittent WAN connection - view logs of connectivity?

Hi Folks,

I am having intermittent connectivity problems. Essentially, anywhere from 15-20 minutes up to 2-3 hours of uptime then I lose my internet connection on all my devices. I can't browse the internet, or stream. After about 20 sec to 1 minute, it seems to reset and the internet comes back. I can literally be watching a netflix stream through roku, it will lose connection, stream stops and then after about 1 minute, connection returns and starts up again without any intervention.

I talked to the ISP (TWC) and they say everything is fine on their end and they are showing no drops on their T3 or T4 lines.

My setup is as follows: Coax from "wall" into an Arris SB6141 cable modem, Cat5 cable from cable modem to NightHawk R7000. Wifi to android tablet, android phone, win10 laptop. Hardwired to streaming device Roku3, Chromecast. All devices lose connection to internet.

I recently updated the firmware from V1.07 to V1.09, but that has not helped.

I also tried resetting the Nighthawk using the reset button with a coat hanger, that did not help.

I was looking at the Port statistics, and I can see the WAN connection drop (i.e. uptime goes to 0 sec) when I lose the internet but the LAN connections stay up and match system uptime. Is there a way to get an extended log of this data (say going back weeks or months?) I found the log tab under settings but it is very limited to the last time I rebooted the router.

I am not sure what my next step is?