Sonos Arc Randomly Rebooting

I tried a different outlet on the first arc I sent back.  Still rebooted. Both tv and arc in same outlet and tv is fine. Arc worked fine for several months prior to this issue. 

I hear you, but perhaps in the interim something has started going weird with the power in your home.  I imagine you don’t want to spend $$ on a battery UPS/surge protector but that could at least eliminate the possibility that the power coming out of your outlets is wonky enough to mess with the arc.

I also have era 100s x4, sub4, beam2, sub mini all fine no issues. 

I'd suggest the UPS option again too, seems like the other possible problems have been eliminated, leaving power as the next most likely suspect.

Nobody outside of Sonos engineering knows enough about the power supplies to have an opinion on why one Sonos on that outlet works and another doesn't. 

Removed all speakers from the room in the Sonos app, then moved my Beam 2 to the main room (replacing arc ultra that reboots) and added tv, 2x 100s, sub4 to it.  Same power, network, hdmi cable to same TV that the Arc Ultra was using.  So far no reboots after about 6 hours… Will see how it goes.  

H9w does the Arc do in the other room?

moved the arc to my office which uses the sonos optical to hdmi adapter (iMac).  Tested it for an hour so far no reboots yet when testing audio from Mac through adapter to hdmi. Also had 2x100s and sub mini connected to the Arc. Will test it with music for several hours tomorrow. I can also test it on a different eArc TV although my first Arc Ultra rebooted even when not connected to a tv at all so will see. 

It always pays to check the silly things, such as the power cord not fully inserted into the unit. A halfway inserted cord could stop making connection as temperature changes or the cord is physically stressed.

Recently, a friend reported that a very old soldering station had failed. On inspection I agreed, however, if I twisted the power cord near its moulded power plug a certain way the unit would operate. Cutting off and replacing the plug restored the 1970’s unit to good as new.

Replacement Arc Ultra that was moved to my office just rebooted. Submitted diagnostics and about to open a new support case. 

They had me disconnect the sonos optical > hdmi adapter and wait for it to reboot.  Did that and after about an hour it rebooted again just playing sonos music via app.  back to support