How did you confirm the line wasn’t the issue? Whenever you call into an ISP, that’s always their default response

Thinking it might be a line issues I’ve waited several hours to see if internet access is restored by itself. It doesn’t, only rebooting resolves the issue. I picked up a  modem/router from my ISP just to absolutely be sure that they’re not the problem. 
 

thanks for commenting. 

did the one you picked up work? 

I haven’t tried it yet. My Arris hasn’t “acted up” in a couple of days. 

when it does “act up” get a screen snip of the cable connections page and event logs. That’ll show the connection back to the isp. 

I will, thanks for the suggestion