Sonos Arc Randomly Rebooting

So far my Arc Ultra is still rebooting randomly about once an hour on average sometimes more.  Unplugged the AppleTV and just tested directly from Apps on LG OLED G4 to Arc and the Arc still reboots.  Support has not been helpful other than suggesting to try a different HDMI cable.  Cable (8k high speed) and setup has not been touched since the initial install.  Swapped the cable and the Arc has since rebooted twice after that.  Am thinking I will move it to another TV to see if I can catch it rebooting on a different TV.  

Been submitting diagnostics which, per support, seem to just show that the reboot happened but not why. Asked what condition would cause the Arc to reboot on its own while TV is still powered on…...

Went through all the troubleshooting steps with support, replacing HDMI cable, resetting the Ultra, disconnected from TV entirely and it still will reboot on its own when playing music straight from the Sonos App. Shipping it to Sonos for a replacement. 

I went through the same thing. I understand them having to troubleshoot but it seems to either be a hardware issue within the Arc itself or the software build. I have three arc ultras in my house. One has been doing it for about two weeks and they just RMA’d that one and then one in my bedroom started rebooting itself last night. The issue now is that when the Arc reboots itself it drops other speakers from the room apparently and I Have to unplug those to have them rejoin the room. 

Yeah, I think its the first time me saving the original boxes has paid off.  You are on your own to box it up to send it back to them.  They do provide the RMA to cover shipping but they dont send you a box.  Mine just arrived at Sonos today.  Will see how it goes from here to get a replacement..

I did the advanced shipping and I will get that money refunded so when they ship me the new I will place the old one in the new box and send it their way. Somehow though, I do not think that is going to fix the problem. 

I havent had the issue with my Beam 2 setup (yet).  Although that one uses a usb-c to hdmi adapter to the sonos optical adapter from an iMac. 

Received the replacement Arc Ultra a few hours ago.  Hooked it up and added my sub and 2x 100s to it.  It just rebooted itself a few minutes ago while watching tv…….😢

Any chance you can switch it from the eARC to an optical connection to rule out the TV being at fault by sending commands that cause the reboot?

yeah I thought of that on the first Arc Ultra I sent back and completely unplugged the hdmi cable so it wasnt connected to the tv at all.  Just played music on the Ultra from the Sonos app while using a different power cord off another sonos speaker and a different outlet.  It still rebooted on its own. 

Since it’s happened with the replacement ARC as well … that to me, would imply that there’s something wonky about the power coming out of that outlet, or your whole home.  Have you tried connecting the ARC to a UPS?  That would help ensure you’re getting clean/consistent power.  And if that still doesn’t solve the issue, then, well … voodoo 🤔