My sub has been connected to my beam for well over a year and out of the blue last night it started making a loud static / white noise sound. I unplugged and restarted it and now the sound has stopped, but can’t get any audio through. 
 

I disconnected and reconnected the sub via the app. Reset the sub to factory settings, rebooted my router and tried connecting via a Ethernet cable, but nothing seems to work. 
 

I’m out of ideas…

diagnostic number 213818091

thanks!