Hi @Alexandre A., welcome to the Sonos Community!
I’m sorry to hear that you’re having trouble with your Sonos Beam. Before any troubleshooting steps, I would advise against factory resetting your Beam Gen 2 (I assume you mean this by hard reset) unless requested by support. A factory reset will clear all data and information from the Beam, losing valuable diagnostics information.
If you try a different device, such as another phone, the web app, or the desktop app, does your Beam show up there or is it also missing. If not, and turning the device on and off again usually fixed the issue, then it would be worth looking into assigning static IP addresses for your device. Many of the community users have suggested doing so if a reboot resolves their issue so you don’t have to constantly restart your speaker. If this also doesn’t help, then I would recommend reaching out to our support team after submitting a diagnostics.
Regarding the ‘sign-in as owner’ message you’re seeing, I would recommend making sure you’re signed in with the email you used to create the system. The new app allows any Sonos account to sign into a system even if they aren’t the ‘owner’. If you only have one account and you’re logged in correctly, then try and transfer system ownership to yourself to see if that prevents the message from showing again.
I hope this information helps!
