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Unplug the Arc from power and reboot your router. If it continues to play a loud banging sound, contact Sonos Support:
https://support.sonos.com/s/contact?language=en_US
Are you using an Apple TV or Xbox and got a loud crash sound followed by the Arc cutting out sound? If so, this is a long-running problem. You can join us in the main thread here:
https://en.community.sonos.com/home-theater-229129/sonos-arc-loud-pop-then-audio-loss-6852340
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