New ISP - now RBR40 loses internet constantly

Thanks everyone that submitted input.   After several hours of working through reboots , changing settings, and updating firmware,  I took the advice of some of you and reached out to Charter/Spectrum.   They agreed to come out again same day.   Turns out the initial setup was done by a contractor and was not a technician.   The contract had a poor connection and left old fittings and reused an existing cable inside the home that was not adequate for the service.     Frustrating when they say it's installed correctly, and it's not.