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Hi , I noticed that inside the arc the center speaker stop working and I only sound come out from  the left and right speaker of the arc . After a minute , the center come back 

I change the HDMI cable , power off completely the TV LG UF6450 ( lastest firmware ) 

the problem occurred 5-6 times per day 

thanks for your help

I would perhaps take a system diagnostic, maybe one with and one without the center speaker working and post the reference(s) back here and contact/chat to Sonos Support Staff via this LINK. 

Hi

reference 399879347 all speaker inside arc working 

Hi Ken 

the problem just occurred here’s the number for diagnostic 404926420

thanks fir your help 

Just to add Kanokano, I’m just a user like yourself and if the Staff here don’t pickup the diagnostics reports, you will be best to follow the LINK in my initial post above and chat/contact with the support staff direct to see if your submitted reports reveal if there is a fault. 

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