R8500 requiring increasingly frequent reboots

I'm not a strong technical guy, but I can describe basic set up and troubleshooting items. I do need some help, but would ask in advance that you keep my lower technical extertise level in mind when responding.

Over the past few months I have been seeing more and more instances of devices connected to the router saying there is "no Internet Connection". We typically have 2-3 phones accessing the Internet at any point in time and they all seem to be affected by this simultaneously. I've tried rebooting the devices, but there is no change. I've also tried rebooting the cable modem and even having the ISP check the modem from their end - Nothing looks wrong and the rebooting of the modem has no effect. The only solution that seems to work is to log into dd-wrt and reboot the router. This clears the problem every time. I am now having to reboot the router nearly every day.

I am running DD-WRT v3.0-r39960M kongac (06/08/19)

I also have Express VPN and connect through one of their L.A. locations. We live in Phoenix.

I do a lot of streaming and downloading of GB or larger video files. Not sure if this plays any part in this or not. 

When I look at the syslog, I don't really understand anything I see. I'm also not really sure how to save its contents or export them to a file, so I have simply copied and pasted them below...

Any help at all would be very appreciated!