The best way to handle the troubleshooting related to Arris router issues is resetting the Arris router. Before starting the reset process, please note down the changes that you made to the default setting because these changes will no longer be present after reset. The answer to your question, how to reset Arris router is given below:
• Find the 'Reset Button' of your Arris router. Usually, this button is found at the back of the router. But if it is not there, then search online to locate it.
• After locating the button, press it for at least 15 seconds, and then release it. You might have to use a paperclip or similar object to press the button.
• Wait for some time.
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https://connectrouter.com/how-to-reset-arris-router/