If you are facing slow internet issues. You can reset the router using web interface. Log in to your router and go to default settings, select the option of default. Another way on how to reset an Arris router is through the reset button.
Here are the steps for the same.
How to reset an Arris router?
Locate the reset button on your Arris router.
Press and hold the button for 20 seconds.
Make sure you press the button long enough, otherwise the router will only reboot and not perform reset.
Release the button and wait for the lights to turn back on. It may take sometime.